I didn't know how the word "gank" came about until there was a post i believe by ghostcrawler a while back that kindly defined it as a sort of abbreviated "guaranteed kill"
Gank stands for "Gang-up and kill." It's a term that has kind of lost meaning over time because in games like WoW it has long been possible to "gank" 1v1 because of the OP nature of stealth openers and one-shot macros.
OMG 13:37 - Then Jesus said to His disciples, "Cleave unto me, and I shall grant to thee the blessing of eternal salvation."
And His disciples said unto Him, "Can we get Kings instead?"