FTPOS Share definition Flag Pronounced as one word (Fit-Poss) Fat Piece Of Shit. Can also be used in conjunction with WTPOS. Look at that dude mowin' down them chili cheese fries! What a FTPOS. FTPOS by Johnny Reds February 16, 2009 0 0 Get merch Get the FTPOS mug. Buy Now — $32.95 See more merch