Grandvagina 

ones vagina that after getting did too many times becomes so open that it resembles the grand canyon

tom-that girl i had sex with last night had such a Grandvagina she must be such a whore

Grandvagina by buzzz902 December 9, 2008

Gravagina 

Another name for a stoop or small porch. It was a very popular slang term in small towns in the northern US area back in mid-late 1970's. Even though the term has the word "Vagina" in it, the term has no sexual relation at all.

Johnny and I were talking on the gravagina.

Gravagina by William J Young June 9, 2011

Grandgina 

A grandmother who has a vagina.

During the awesome sunset with Keith, my grandgina twinkled like it did in yesteryear.

Grandgina by Carls words October 11, 2021