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1.
Acronym for "Shut your fucking pie-hole."
If you didn't bother to vote in the last election, SYFPH about who's in charge.
by Bogenrim January 11, 2007
 
2.
Shut your fucking pie hole.

Commonly used by members of the DailyKos community.
SYFPH James Carville!
by lochners bakers November 23, 2006