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…
This insult is so bad in most countries it is illegal it will make your opponent die ,come back alive,and kill thereself
Jimmy: ur mom gay lol
Devin: yo dad lesbian lmao
Jimmy: you’re granny tranny
Devin: yo fam you uncle bisexual
Jimmy: yo aunt pansexual
Devin: your grandpa queer YEET
Jimmy: turns into a neutron star L