in. to release intestinal gas through the anus. (Often objectionable. One of the classic four-letter words. It should be noted that English does not have a single, “polite” word, noun or verb, for this matter. Break wind is common, but there is no parallel noun. See the complete list of all entries with fart in the Index of Hidden Key Words.) : Okay, who farted?
n. the sound or odor of the release of intestinal gas. (Often objectionable.) : Who made that smelly fart?
n. a stupid, despicable, and annoying person. (Usually objectionable.) : The guy's nothing but a fart. Just forget him.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
fart
O.E. feortan, ult. from PIE *perd- (cf. O.H.G. ferzan, O.N. freta, Skt. pard, Gk. perdein, Lith. perdzu, Rus. perdet), of imitative origin.
[fahrt] 
Vulgar.
(n.)