Grandmuthah 

1. A grandma who does not act like the stereotypical grandma
2. A really cool grandma

Nugget: My grandmuthah bought her a book by some guy named Timothy Freake...
CoNAWR: Wow, you have a really cool grandmuthah.

Grandmuthah by Elizabeth Tudor May 31, 2006

Grandmuthafucker 

somebody who fucks grandmothers!

"ooooh young MAN"

Grandmuthafucker by Liam Bucket January 31, 2004

grandmuddah

When your grandmother is being a bitch and you wanna keel her, but shes younger than you

"Hey bitch," said my grandmuddah.

"Hey grandmuddah," said my sister. Then my grandmuddah suffocated my sister with a grocery bag.

grandmuddah by I am your grandmuddah May 15, 2018