3 definitions by knitman

Top Definition
Referring to either the act of sex or calculus depending on the circumstance. Sometimes purposefully ambiguous.
Guy 1: I did a lot of rigorous activities over the weekend.
Guy 2: Really?
Guy 1: Yeah, but I'm still screwed for the calc midterm.
by knitman April 01, 2009
Short for fucking bitch. Usually used without an accompanying sentence. Sometimes used to insult someone without them knowing. SPronounced: Eff-bee
Guy: Do you want to go to prom with me?
Girl: No, so stop asking me every day.
Guy: FB.
by knitman April 01, 2009
Short for filthy mother fucker. Usually used to express disgust towards a person. Pronounced: Eff-emm-eff
Guy 1: Hey did you do rigorous activities this weekend?
Guy 2: FMF.
by knitman April 01, 2009
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