Muff

Back in the 90's this word meant being smacked upside the forehead when you least expect it.

Boy 1: Hey, want to see something cool?
Boy 2: Yeah.
Boy 1: Muff.
Boy 2: Ah! What you do that for?
Boy 1: HA HA HA! You walked right into that one.

by Falap January 28, 2010