grandsister

When your sister marries your grandfather.

Dude your grandsister is totally hot.

by Big Man25 January 7, 2011

Grandsister

The granddaughter of your sister.

DUDE YOUR GRANDSISTER CAN COOK? AWESOME!

by Twight0931 July 16, 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 22, 2020

grandsister

Your grandmothers sister.

boy 1: oh what a old hottie
boy 2: that's my grandsister

by tjingtjong112 May 9, 2019

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

Grandsister

Idk ask me?

Bro your grandsister pooped her pants sus

by I’m not Paul February 22, 2022