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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
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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
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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
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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
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