Your grandma's grandmother. It's a family member in your family tree that you'll see at a family reunion, and will have no idea who they are. Then they'll go up to you and tell about how they used to change your diapers, and ask if you remember them from when you were a microcell. They get offended when you say no. ✌🏼

Great-Great-Grandmother -> Great-Grandmother -> Grandmother -> Mother -> YOU -> Offspring -> Grandchild -> Great Grandchild -> Ect
"My Great Great Grandmother is so old that she died at 163 years old. I'm happy she finally died."
by Lavenders_Llama March 23, 2021
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1. The mother of one's stepgrandparent.
2. The stepmother of one's grandparent.
My step-great-grandmother is a good person.
by Elivaldeq November 24, 2019
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The ultimate counter to Ur mom gayest

it easily repels the attack while attacking the enemies life points directly
Tom: Hey faggot ur mom gayest
You: "Ur great grandmother is homosexual"
Tom gets AIDS
by You're Mom Gay (Superior Form) September 5, 2019
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The worse then Ur dad lesbian, Ur mom gay, Ur granny tranny, and your Grand pap a trap combined; Everytime it is said a galaxy gets sucked into a black hole
Jim: Ur granny tranny
John: Ur grandpap a trap
Jim: well your great grandmother a dick sucker
John: *Gets Sucked into a black hole
by jjjJJjjJj05 March 20, 2018
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