Written by mathcore band, The Fall Of Troy. It's acronym stands for Fucking Cock-Punch Remix. Sometimes pronounced, "eff cee pre-mix".
It is a sped up, remixed version of another song, from their previous band, F.C.P.S.I.T.S.G.E.P.G.E.P.G.E.P
Dude 1: What the hell does F.C.P.R.E.M.I.X. mean anyway?
Dude 2: Fucking Cock-Punch Remix.
Dude 1: lolwut?.