Ganking is moving around the battlefield with the specific intent of taking down one or more opposing Heroes. Generally seeks to exploit a numeric advantage or an element of surprise. If someone calls out for a Gank, it means they want someone to come in behind their enemies and kill them. Ganking, is a twist on the idea of Flanking. Having a third person come in from behind their enemies will trap them in a pincer maneuver hopefully allowing you to kill them quickly. Nova or Zeratul are good Gankers.