Acronym for "Fuck That Shit, Bitch"
first coined (in the song of the same name) by The Lazardos (pop-punk band from Manchester, NH) in 2000(?)
RIP Jack P. Fallon, Drummer of The Lazardos
"Dude, this is a no smoking zone..."
mother: "son, go take out the trash"
son: (under breath)"FTSB, im gonna go smoke a fattie"