fuck face is the full word but it is FF for short. this definitely is very helpful in multiple situations when someone is being weird and you really just need a great adjective.
bobby: you smell like shit
jamal: ok fuck face
Tyler: what the hell is up mike? big M, mikester, mikey, M drizzle. woah don’t through those hands at me. ok bet let’s fight.
mike: bet
tyler: ok let’s go rn on sight
mike: * throws punch* and easily kicks tyler’s ass
tyler: *crying*
mike: that’s what you get FF (fuck face)