Top Definition
When your farts make a noise other than the normal toot toot.

Initially created to fill a gaping hole in emoticons because there was no smiley for "gassy", thus ":) + /'\ " had to be used.
Please note, however: If your ass is truly making a clanging sound, you should seek immediate medical attention.
"My cowbell o' gas is ringing loudly tonight."
"Jesus! That was quite a cowbell o' gas!"
by bellybellbel February 09, 2010

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