A woman who sleeps with a man after the first date (or first few dates)---and then spends the entire 'relationship' backtracking from the bed, trying to get to know the soul of a man---whose dick she has already had in her mouth.

As in: the equivalent of trying to switch on a lamp, without first plugging it in.
"John saw Mary as a One-Off Slut, because she dropped her panties for a few beers."
by Nannette LaRee Hernandez March 16, 2018
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When a group of females compete against eachother to try and fuck the same guy. Things girls do include making eachother look bad, wearing slutty clothing, and sexually flirting with the guy. Winner is the first girl who sleeps with the guy
Alex- Omg there's a new hot guy at school

Tara- Promise you wont go into the slut off for him
Alex- Nah, that's Hannah and Maddys job
by majorfreaksallday July 15, 2017
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