2) To playerkill in an MMORPG.
3) To insult or slander.
"Why do his characters keep getting ganked?"
"I don't have any proof yet...but I think Brent has been ganking me."
Although it has been used in this way for many decades, and still is, in recent years it has also been used as an abbreviation of 'gang kill' in MMORPG's.
Gank = Steal
Ganking = Stealing
Ganked = Stole
In MMORPG's - Gang kill. To attack someone using overwhelming odds against them.
This pokie (poker machine) keeps ganking my money.
Can i gank a couple of smokes?
IN MMORPG's - Let's be cowardly bitches and gank this guy.