Occurring mainly in MMORPG's, Killscabbing is the act of waiting until another player has almost killed an enemy, then leaping in and finishing it off, thereby depriving the other player of experience points and or items.
On WoW as Wrather goes to kill a tough enemy, another, far weaker player suddenly rushes in and kills the creature, taking the experience points and items that rightfully belong to Wrather. In frustration, he proclaims on the general chat channel. "Oh you f**king kill scab!"
by Bahamut_256 December 5, 2006