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grandsister

When your sister marries your grandfather.
Dude your grandsister is totally hot.
by Big Man25 January 8, 2011
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Grandsister

The granddaughter of your sister.
DUDE YOUR GRANDSISTER CAN COOK? AWESOME!
by Twight0931 July 30, 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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grandsister

Grandsister is your grandmothers sister, yeee boiiiii
Boy 1: Ohh that old hottie
Boy 2: That's my grandsister.
by tjingtjong112 May 9, 2019
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grandsister

Your grandmothers sister.
boy 1: oh what a old hottie
boy 2: that's my grandsister
by tjingtjong112 May 9, 2019
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Grandsister

Idk ask me?
Bro your grandsister pooped her pants sus
by I’m not Paul February 21, 2022
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