The "cool" grandpa.The One That Always Gives You Whatever You Want.
Uncle Grandpa: Want An IPhone 6
Me:Umm....Yep
by gabehare123 April 1, 2015
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A term used to describe pyjamas only an old man would wear.
Did you see John last week? He ran across the street in his uncle-grandpas!
by GrandpaJoe1240281 October 29, 2020
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When your Step-Grandpa has an affair with your biological aunty, then marries her. Technically not insest, but still immoral.
He used to be my Grandpa by marriage (step) but had an affair with my aunty, so grandma kicked him out and he married aunty. He used to be grandpa, but now he is my uncle ... my uncle grandpa
by anon-nz August 10, 2019
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