https://www.urbandictionary.com/define.php?term=TSIF&defid=3735258
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.