Top Definition
some one with very foul breath
she has a fart mouth, yeck!
by dfg January 03, 2004
One whose mouth is constantly farted into, and who therefore has farty breath. To make matters worse, people like this tend to insist on talking loudly and constantly.
After that fartmouth got done yelling about child support for two hours, the entire room smelled like a big giant fart.
by hjgdshafgyewh November 24, 2010
I say its a well thought up saying.

A good comeback when u are having words with some-1.
Whitetrash: That fartmouth is a gaytard.

Dirt: You are a fat fartmouth.
by Ren Walkero September 13, 2008
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