Top definition
Noun - A gf (or girlfriend) who is in any way reminiscent of methane from a rat's behind. This can range from her scent, her appearance, and can encompass her entire personality.

"rat fart gf" prefers anal sex to vaginal, and wears a diaper to bed most nights.
Guy #1: "Hey man, how's your gf?"
Guy #2: "She's alright, but she spends hours toiling over the toilet!"
Guy #1: "Sounds like you got yourself a rat fart gf."
Guy #2: "Shit man, what do I do?"
Guy #1: "Be a man and rip that booty!"
by oilyassandtwat December 22, 2009
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