Grandfatherphobia 

The fear of grandfathers.

My friend is afraid of my grandfather, I think he has grandfatherphobia!

Grandfatherphobia by Fredick Beanburger April 5, 2022

grandfatherphobia 

Being scared of grandpas

My friend Nev has grandfatherphobia

grandfatherphobia by TheGunslingerYT April 5, 2022

Grandmother trying to catch a duck 

when there's an animal (Most likely a duck) in your backyard and you get your feeble grandmother to try and catch it

well that's one Grandmother trying to catch a duck

Grandmother trying to catch a duck by Boi boi mega edge! May 28, 2018

grandmother 

Parent's mother.

My grandmother is a good person.

grandmother by Mr. Jacov November 23, 2019

grandmother heroin 

the richest form of heroin found in any stock market or black market

Hey. You bring the money?
yea. you bring the grandmother heroin?

grandmother heroin by Tablecloth_wanker March 23, 2020

Grandmotherfucker 

Also known as your grandfather.
Named for mating with his wife to produce children who then become parents of his grandchildren.

Ben: Me and my motherfucker just went to see my grandmotherfucker for Motherfucker's Day (also known as Father's Day).
Gregory: My motherfucker (or my father) is such a charm and treats you with love.

Grandmotherfucker by gregben July 6, 2021

Ur great grandmother is homosexual 

The ultimate counter to Ur mom gayest

it easily repels the attack while attacking the enemies life points directly

Tom: Hey faggot ur mom gayest
You: "Ur great grandmother is homosexual"
Tom gets AIDS

Ur great grandmother is homosexual by You're Mom Gay (Superior Form) September 5, 2019