A fork of Rural Dictionary
To masterbate. Taken from the popular sketch comedy show Cheppelle's Show. The sketch refered to involved a man's Granny walking in on him masterbating in the bathroom. Can be used as an exclamation to warn someone that you're spanking the monkey, or used as a verb.
Person 1: I'm hungry. I wonder what's in the kitchen... Person 2: Granny don't! Person 1: Where's Phillip? Person 2: In the basement, probably having a "granny don't!"