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An abbreviation for "she wants to fuck you." Usually uttered from one bro to another bro after a girl has shown her hand.
Guy 1 to Guy 2: "So I'm visiting my brother at NYU this weekend and we signed up for a pong tournament. Cash prize for first place is $200."
Random Chick 1: "Oh my gosh! Good luck!"
Guy 2 to Guy 1: "S.W.T.F.Y., dude."
Guy 1 to Guy 2: "Truth."
by stickitinplease October 28, 2010