1. The grandmother of one's stepmother or stepfather.

2.The stepmother of one's grandmother or grandfather.

3.The mother of one's grandmother's husband or grandfather's wife; but not their biological great-grandmother.
His Step Great-Grandmother was the wife of his Great-Grandfather.
by Stepman December 11, 2017
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Great-great-great-great-great-great-grandmother.
My 7X-grandmother is a good person.
by N8953SW June 26, 2021
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grandmothers string is a magical invisible string that gives you the uncanny ability to randomly develop skills that give you the capability to skateboard, no sorry ROCKboard down the sides of waterfalls and jagged rocks, it also helps ytou find your way to a singing boy, baracaded in a cave inside of goblinland
do not worry for i have grandmothers string....are you comming?
by OMG YAY May 4, 2008
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Dude I went down Hollywood Blvd and pick me up a San Francisco Grandmother, 20$ Gummers and 50$ Bummers.
by TheMfingStockingstuffer October 9, 2021
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