FMF

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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FB

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

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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

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