Noun. In World of Warcraft, someone who takes great pleasure in ganking other players. Generally used in a positive light.
Dude, look at that 80 rogue over there, killing all those lowbies in Tarren Mill. He is such a gankster.
An uncommon spelling for the word "gangster." This term is usually aimed towards the ghetto scene as a positive adjective. It usually compliments language, music and clothing but is not limited to just that.
-"Katie has been really fresh in the hood lately."
-"Yea i know, shes so gankster."