Top Definition
1. (n.) The skin beneath your chin from the bottom of your chin to your neck. Your 'underchin', so to speak.

2. (n.) A game in which opponents smack each other beneath their chin throughout the day until they get tired of it and call timeout.

3. (v.) The act of smacking someone beneath their chin.
I just smacked Garrett in the fimmis because he wouldn't shut up.

Fimmis - Wow, what an exhilirating game!

Yo, you just got fimmised!
by Poop DeDoop December 06, 2010

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