Just a nonsense word. Kinda like saying "just dicking around".
P1: Hey, what were you doing last night?
P2: Just fistafuckin'cuffin. What about you?
P1: That makes absolutely no sense what the fuck Randy this is why I hate you. You just use these stupid fake words. Fuck you Randy. I hate you.
by DickSpends June 5, 2017
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