Top Definition
Meaning "Thank Satan It's Friday"

Similar to "TGIF", but used by Satanists.
TSIF! I'm going to drink some pig blood.
#tsif #tgif #thank satan it's friday #tisf #thank satan
by Bloodbath87 March 04, 2009
That Shit Is Fucked
Guy 1 : Gawd Damn this is some good ass ice cream.
Guy 2 : Let me get a lick of that shit dawg.
Guy 1 : TSIF
Guy 2 : Come on, you know I'm straight busted till the furst of da Month.
#fucked up #bad #oh shit #damn #hell no
by bymoosek February 19, 2009
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