An affectionate name for "grandmother," (esp. a somewhat cold, possibly drunk grandmother with aspirations of social standing.)

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.

the thing that you don’t have when you’re phones percentage is over 20

grody as shit

When multiple males have sexual intercourse with very few, usually just one, female.

Gāngy (pronounced gone-gy) is a descriptive word with many uses
it can mean the something is big and/or clunky

it can also be used to describe a person who is annoying and/or weird

Generally a girl that wears extreme flaired jeans, boobtube tops, sneakers and their rediculous hair pulled back to their head in a pony tail.
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.

when youre feeling that something is not quite right, a little bit queasy.