Actually a misnomer for a Zergling Rush, Zergrush refers to a tactic in which a player of StarCraft attempts to overrun an enemy with large masses of weak units (See [Zergling]) so early in the game that the enemy has not had enough time to properly defend himself. Can also be used to describe any occasion in which a person is swarmed something (i.e. animals, mobs, bills) and are completely unprepared.