FTSLSAR Share definition Flag acronym for “fuck that shit let’s start a riot”, appropriate as a declaration of seeking change for societal or social wrongs. Anna: Did you hear that they’re canceling PROM this year?Jenna: No way that’s happening. FTSLSAR! FTSLSAR by Kristenevol June 27, 2022 0 0 Get merch Get the FTSLSAR mug. Buy Now — $32.95 See more merch