On the television show Arrested Development, Maeby Fünke and George-Michael Bluth call their grandmother (Lucille Bluth) "Gangy" in many instances.
The etymology is unclear but it's frequent use in context makes the meaning clear. The spelling "Gangy" seems to be the generally-agreed upon spelling on Wikipedia, IMDB, and most TV sites.
Michael Bluth: "You all right? Sorry. Your grandmother had a little accident here."
George Michael Bluth: "Oh. Does that means she's gonna have to come live with us?"
They usually hang around the gangs and act like they are as tough as the boys that are in the gang.
Sometimes also tend to tap the dirty boys in the gang.
Scott: "didn't you hear she got aids from one of them dirty boys?"