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.
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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The System is Fucked

It is used either in place or along with ACAB (All Cops Are Bastards). It is saying the American justice system is corrupt, or fucked.
Man 1: Bro, I'm dying. Call 911.
Man 2: Naw, bro. TSIF.
by asadpuppetshow August 26, 2020
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