Define Great Granny Meaning

Great Granny
Known as GG. Has the coolest grand kids and is the life of the party. A Great Granny always has mints in her purse.

You have the coolest Great Granny.
By Carmella
Your Great-granny
The ultimate and the worst insult, worse than your mom and your granny.

your great-granny a gay tranny.
By Krystle