1. To pick on someone weak, then run away when somebody strong attempts to retaliate. From the "Eve-Online" (www.eve-online.com) MMORPG, in reference to a character, Ginger Magician, who became infamous for picking on newbies but running away and even logging out of the game when someone stronger than him fights back.
Same meaning as to "do a ginger"
My defenseless hauler got destroyed by a guy in a cruiser, but he totally gingered when I came back a few minutes later with my battleship.