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Grandstaff 

A 12 Incher AKA a Grandstaff
Grandstaff by Grandstaff February 14, 2010

Going to Grandmas

The act of telling your girlfriend that you're going to your grandma's house, but really opting to stay home all night masturbating and playing video games.
"I'm sorry Grace. I can't do anything tonight because I'm going to my grandma's."
Going to Grandmas by Rabix April 2, 2005

Grandmaster Galaxy

A Satanic torture device that somehow found it's way into Super Mario Galaxy 2
I tried to beat the Grandmaster Galaxy in Super Mario Galaxy 2, but I died another 53 times

Grandmaster Sheehan 

A guy who is into being forcefully fucked, bucked, or non consensual sex
“The ladies call him Grandmaster Sheehan, you already know why”

grandmas brownies 

When you are giving you're grandmother anal, often times her prostate gives out and she will shit all over your dick, proceeding her to suck the shit off your dick and calling them grandmas brownies.
grandmas brownies by N1gg3rF@gg0t January 5, 2015

grandmat 

grandmat
grandmat by shsl gae January 15, 2021