grandbruther

Most known for being zach and only zach

Ayo your grandbruther zach is sus for pus

by I’m not Paul February 21, 2022

great grandbrother

When your brother marries your great grandma

Here's an example: DON'T FUCKING DO IT. The Great Grandbrother is a disgusting thing.

by Jimmy JuJu November 17, 2017

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.

by Nullivoid December 21, 2020

Grandbrother

When your 90+ grandmother has conjugal visits in a nursing home and becomes miraculously pregnant, resulting in a baby boy

Dude, last night I had to babysit my grandbrother because my grandmother broke her hip.

by Brent Hammy June 5, 2015