Insecure douche bags over an online game known as "MapleStory". They are known to KS and disconnect hack players as to ruin their experience online. They can also be described as "annoying children" or "Bitchass McFartSuck". BF is equivalent to Bigfoot and they watch over people and 'kill steal' the monster.
OH THAT BF (Bitchass McFartSuck) TOTALLY KSED ME AT BIGFOOT!" --- "Dude don't be such a bf police I was here first