Definitions by Blahblahblahblah123:DDDD

Grandpa Shark 

To fist someone in the vagina and ass at the same time. It looks like a shark's mouth.

Girl 1: He grandpa sharked me!
Girl 2: Ohh, I bet you loved it!

Grandpa Shark by Blahblahblahblah123:DDDD July 29, 2010