An anus that is used for sexual intercourse. An asspussy will generally be penetrated by (but not limited to) a penis (or penises) and/or other appendages. Asspussy is also most likely to be shaved and willing to accept cock at any given moment. The presence of asspussy implies the act of "fucking," not "making love."
After donkey punching her, I rammed my pole into her asspussy and blew my wad into her sludge farm.
I fucked her asspussy until it blossomed like a fudge flower.
I pulled out and shoved it in her asspussy because was far tighter than her coochie.
That twink loves to show off his asspussy like it's the fucking Queen of England.
I retracted from her asspussy and promptly drove it into her mouth.
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.
Man, I just watched the funniest nutshot video ever.