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grandsister 

Dude your grandsister is totally hot.
grandsister by Big Man25 January 8, 2011

Grandsister/Grandbrother 

When your son/daughter has a baby with your mom/dad, said baby becomes the your grand-sister/grand-brother.
Today I'm taking my Grandsister/Grandbrother to the park.
The best family name that u could have ;) also a random Swedish soccer player has this surname.
Mom: Did u hear about the family who only has good looking people in it?
Tom: Yeah, must be the Granqvist family
Granqvist by heymynameisbob October 2, 2020

Grandquist 

Fucking fat ass, plays Elden ring and destiny 2 all day and won’t shut up about it.
“Man bro you’re such a Grandquist, lose weight nerd”
Grandquist by Grandquist April 14, 2022

Grantist 

One who practices Grantism.
Blake: "So, wait... You think sex should be celebrated?"

Brittany: "That is what all Grantists think."
Grantist by Alana Hearts March 17, 2011

Graduistmas

Graduation and christmas party combined together as one celebration. Termed by poor college students during their UHM Fall 2008 commencement ceremony.
"Hey brah where the party at after graduation?"

"Dude, there is none until the 25th."

"Oh how come?"

" To save money. my family is having a graduistmas party instead."

"Oh cool."
Graduistmas by xMas, Aloha state December 28, 2008