grandpa your grandma
To have sexual relations with another person’s Grandmother (usually leading to criminal sexual assault charges).
Andriy: Yo u tryna get fucked up today? Cop some valid shit
Eugene: yea aight how bout I grandpa your grandma?
Nick: niggas gonna grandpa your grandma…
Eugene: yea aight how bout I grandpa your grandma?
Nick: niggas gonna grandpa your grandma…