DTFSU Share definition Flag Down To Fuck Shit Upi.e. crash a party or wreck a party (in a good way or destructive way) John: Hey man, there's a sick triple kegger at my friend's place with 40 sorority chicks. You DTFSU? James: HELL YEA! Lets get some tonight! DTFSU by Roomie#3 December 9, 2009 0 0 Get merch Get the DTFSU mug. Buy Now โ $32.95 See more merch