3 definitions by knitman

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 1, 2009

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 1, 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 1, 2009