A term used when a woman is incredibly petite and gives birth causing her vagina to rip and connect to her ass. Causing the creation of one singular opening-The assgina.
"My wife just gave birth today, the baby was huge though. It's going to be forever for her assgina to heal."
"Dude i'm dating this super petite chick now." "How small is she?" "Assgina small." "Duuuuude, nice."