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Pronounced Simbeefee. Acronym for "shut your mouth before I fuck it"

Short phrase you can use in public to tell your girlfriend to shut up in a vulgar way without offending people around you.

Used to silence someone with emphasis.
Girlfriend says, "Will you carry my purse?"

Answer. "Symbifi"
by heeg January 03, 2011
0 2
shut your mouth before i fuck it.
GUY1-im going to the club.
by 9deuce October 04, 2009
5 5