Someone whose ass emits an odor strong enough to create casualties reminiscent of WWI's Mustard Gas.
by Krazy Kraka February 24, 2004
The brownish-yellow discharge found in one's undergarment after an evening of junk food and/or bad beer. It can be delivered by flatulence, or a steady leak.
by biggdogg September 04, 2003
Hot Yellow Ass Mustard: the result of anally straining oneself beyond one's limits then exposing that matter to a heated element.
After we ate the bean burrito we had a farting contest in which Matt pushed too hard and sprayed ass mustard all over the space heater causing it to become hot yellow ass mustard.
by Frankendouche August 30, 2005