Top definition
Thunking with 3 or more people, basically the dirtiest orgy imaginable.
Chick 1: "Fuck I'm so sore"
Chick 2: "Yeah, that tri-thunktum was nuts! I didn't think it was possible."
Chick 1: "I know! Did you see that guy's *****? How did it get there?"
by fukmi June 14, 2010
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