Most noticeably stands for "I'm talking scorched earth mother fu**er" . Based on the game Lord Of The Rings, the nerds basically just made this up to show there "superiority" when "owning" in a game (Not necessarily LOTR) .
BeZerk-Beaver: just got owned in a -ap for naabz
TriNiuM: omw, you serious you noob?
BeZerk-Beaver: serious, that mort owned like ITSEMF !