A base slut is someone that plays the bases alot. I.e. 1st base making out. 2nd base more advanced making out. 3rd base Oral sex. And a homeplate (homerun) being sexual intercourse
Man, that Aiisha, she a base slut she on 3rd base every nite with a different guy.
by Ryan & Breanne July 15, 2004
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The girl who will do pretty much anything but sex, a bro's true challenge

Three base meaning first, second, and third base but wont let you score.
"She blows me all the time but wont let me hit!"

"You have a Three Base Slut on your hands"
by RawDogListon September 1, 2011
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