aristocratic sounding laughter, or kind of a hick laugh
sound a large serving of mashed potatoes makes when it hits the plate (also a corresponding measurement of same) (ref)
the rumbling sound produced by the movement of gas through the intestines of animals, including humans. Stomach growling.
the sound of wedding bells (features in the poem "The Bells" by Edgar Allan Poe)
genus Pyrrhocorax of birds in the Corvidae (crow) family. now universally pronounced 'chuff'. However it probably originally rhymed with "how", as 'chow' is a reasonable representation of its call (according to this website). link1 (white-winged chough), link2 (red-billed chough)
1. chatter, prattle 2. to make an abrupt striking sound or series of sounds, such as footsteps 3. cry of a bird , especially fowl. see also: cackle, cluck 4. Sound of a late 19th century gun being closed after loading, according to a reply to a yahoo!Answers post about the sound of old guns
sound of a train sound of a train riding on a railroad switch or joint (Song of the train by David McCord, in Noisy poems by Jill Bennett). also: clickety-clack
a sharp, forcible or resounding noise
sound of a train sound of a train riding on a railroad switch or joint (Song of the train by David McCord, in Noisy poems by Jill Bennett), see also clackety-clack
sound of a coin put into a vending machine (from the graphic novel "Jimmy Corrigan: The Smartest Kid on Earth", ref)
1. bird : the peculiar sound of a brooding hen 2. To make a clicking sound with the tongue
sound of metal when struck
tolling of a bell
Sound of a bass-guitar. From: Mike Dirnt, the bassist of the rock band Green Day. Dirnt's birth name is Michael Ryan Pritchard. According to Wikipedia, at school, he would would often play "air-bass", pretending to pluck the strings, while making the noise, "dirnt, dirnt, dirnt". As a result, his schoolmates began to call him "Mike Dirnt". See also Yahoo Answers. Related: wub wub, wob wob and other sounds of bass in dubstep music.
(possibly of imitative origin, but debatable) English language vulgarism most commonly used in reference to flatulence. Onomatopoeia for farts have been suggested in various internet forums in response to questions of people who needed a word to describe the sound: eg. here and here. The suggested words include brrt, braaah, THPPTPHTPHPHHPH (Calvin and Hobbes), phhhhhhrt, PPPPPPPPPPPPPPPPPPPPPPPPPPP, pff, prtrtrtrgurtrufnasutututut, prrrt, PFFT!, PHHhhhh..., SPLPLPLLLP, WHOooooffff, poot, prrrrrrrvt, scraeft, ppppppwwarrrrppppp, pllllllllllllllllllllllllloooooooooooaaa..., RRRRRRRIIIIIIIIIIIIIIIIIIIIIIIIIPPPPP, fuuuuuuuuuuuurrrrrrrt, thhhppbbbb, verrrrrrrrrnnnnnntttttt, hooooooooooooooooooooooooonk, pbpbpbpbp, frr frr frrrrrr rampooooooooo ag, pppppppptttttttttttttttttttttttt, flurpppppppppppppppppppppppppppppppppppp... Also, according to many responders it depends on the fart (farting can make many possible sounds).
to flood or spray thoroughly with water or other liquid, as for cleansing purposes. flush can have many meanings but in the sense of flooding with liquid it can be seen as imitative
1. gibberish is rapid, inarticulate, often foolish sounding speech, 2. according to this wikipedia entry, it is also a verb for the sound made by apes/monkeys (as in "dogs bark, monkeys gibber")
laughter. most common form. intensity grows by adding ha's. absence of an exclamation mark can be a hint of sarcasm, or indicate a polite, but unenthusiastic laugh. dependent on context, tone, facial expression, etc. Also: haha
Howler monkeys are widely considered to be the loudest land animal. The main vocals consist of loud, deep guttural growls or "howls". Their vocalizations can be heard from 3 miles (4.8 km) away. It is hypothesized that the function of howling relates to intergroup spacing and territory protection, as well as possibly mate-guarding. more
to move or be moved off the ground. Possibly imitative of the sound of feet coming into contact with ground when landing
sound of heavy metallic objects colliding
sound of striking with a sounding blow. As in knocking on a door
The kookaburra is a genus of birds native to australia whose name is imitative of its call. The call sounds a bit like hysterical human laughter, or maniacal cackling, depending on the species. more info, video
Sound of a skateboarder skateboarding. Skateboarder doing a trick: "Krrrrrrrr, snap! (pause) Crack! Krrrrrrrr..." user Mikemega on answerbag.com
Sound of a beating heart. This seems the most common spelling, used in medical texts. Also: dup-dup; ba bum; plop-plop; thud-thud; pop-pop; Sometimes the heart is said to throb and throb is also thought to have imitative origin. (Yahoo Answers, 1, 2)
human disease pounding pump heartbeat
sound made by murlocs (creatures in the massively multiplayer online role-playing game (MMORPG) World of Warcraft. also: mrclughluhlua, maagluuuuughhhhhh, mrglmrglmrglmrgl, aurrrrrrrrruuuuggguglugglugglugluguaa (according to players)
laughter, this is usually an evil sounding laugh. also: muahaha, muhaha
bird species name (Colaptes auratus). medium-sized member of the woodpecker family. It is native to most of North America, parts of Central America, Cuba, the Cayman Islands, is one of the few woodpecker species that migrates, and is the only woodpecker that commonly feeds on the ground. The song of the Northern Flicker is a loud wick wick wick wick or (according to some sources) a squeaky flick-a, flick-a as in its name. about this bird
1. strength, power (you need to put more oomph in your story) 2. sex appeal 3. a low pitched grunting or thudding sound (Oomph! grunted the boxer when punched in the gut).
heavy sound of landing
Sound of an old pistol firing, according to a post on Yahoo!Answers
sound of pounding ("Misoso: Once Upon a Time Tales from Africa", by Verna Aardema)
short for raspberry tart, rhyming slang for fart: a sound of contempt made by protruding the tongue between the lips and expelling air forcibly to produce a vibration; broadly : an expression of disapproval or contempt. Also "rasp", "razz" or "Bronx cheer". As in "blowing a raspberry", "making a Bronx cheer". Ref: thesneeze , wikipedia.
sound of sliding metal on metal. verb: The metal rings schliked along the rod as I slid the curtain open to peer into the room. (thank you Larry!)
to utter a shrill piercing cry. note: the vocalization of eagles is often called screaming, although according to this wikipedia article, Bald Eagles normally squeak and have a shrill cry, punctuated by grunts, and the scream that is found in films this is usually the call of a Red-tailed Hawk, dubbed into films for dramatic effect.
command to be quiet, often paired with holding the index finger vertically against the lips
sound of skiing through the snow (ref)
(Porzana carolina) A small, secretive bird of freshwater marshes, the Sora is the most common and widely distributed rail in North America. voice: Call is a long, high descending whinny. Also a two-noted "sor-AH" call, with second note higher. about this bird
landing with a smacking sound
sound of a piano landing on someone's head ("Garfield", Jim Davis)
sound of landing (after a jump). also: tup. from: 
Sound produced by quickly opening a folding fan. Urban Dictionary. Made famous by drag queen Katya Zamolodchikova
sound of landing (after a jump). from:
(Catharus fuscescens) bird species belonging to the larger group of thrushes. voice: Song a resonating, ethereal "da-vee-ur, vee-ur, veer, veer," descending slightly in pitch. Call note is a nasal "phew" or "veer" about this bird
the sound of colliding bodies, a slamming sound, or the sound of a punch to the jaw. Find more hit/ punch words
A sound recording played backward.
ref
ZOOOSH ZOOOSH ZOOOOOOOSH ding ding ding
diesel train. from this book: 
Click here for more train sounds
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