When a guy abstains from all female company and communication for an extended period of time (usually 30 days).
Sergiu: Hey Joe? you still chatting to Erika?
Joe: Naw man, I've had my fill. I'm on a girl-fast.
by Jimmy Struthers January 9, 2012
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can be either someone whos a slut( or at least gives the idea that she's easy) and/or a really fast runner
( usually the best is a combination of both, but being more of a flirt than actually putting out)
"fast girls finish first" -nike running shirt
by xcrunner06 April 30, 2006
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A girl who is knida whore-like and easy to get in the sack.
"Man, that Ashley really is a fast girl" "Yeah man, I fucked that bitch up the wall the day I met Her!"
by ATown BTown April 11, 2006
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A girl who has little ambition in life. One who parties heavily and lacks purpose, job or career goals.
I want to hit it with that fast girl.

No one wants to date a fast girl.
by MissVirginific September 7, 2010
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