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Meaning "Thank Satan It's Friday"

Similar to "TGIF", but used by Satanists.
TSIF! I'm going to drink some pig blood.
by Bloodbath87 March 04, 2009
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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.
by bymoosek February 19, 2009
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Thank Science It's Friday. Used commonly by those who do not believe in God or of higher beings. Rather than saying it is Friday because of God's ways, TSIF says it is because of the laws of nature, and how once every 7 full rotations of the Earth the manmade term "Friday" applies for slightly over 24 hours.
Sam: TGIF
Chris: Bro you know I don't believe in God I'm offended by that statement.
Sam: Oh shit I'm sorry, TSIF.
by CactusEvergreen November 03, 2017
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