A fart that stinks so bad that it causes the eyes of those unlucky enough to smell it to tear up. Also known to be one of the densest of all farts- it takes about 5-6 minutes for the smell to dissipate.
Gross! Sammy just let out an onion fart!
by Shawn B. June 27, 2003
1 more definition
A fart that smells particularly of onion. Usually experienced the day after eating a foodstuff containing onion, especially burgers or hot-dogs.
Man, that was one stinky onion fart
by Kosmos September 03, 2003