Short, high velocity bursts of semen that can burn the mouth during oral sex.
Guy 1: "Bro, I just busted a popcorn nut in my dog's mouth. I think I need to take her to the vet."
Guy 2: "Oh man, that's gnarly bro. Can I try next week?"
When you shoot jizz during a particularly hotmasturbation session, only you shoot wild. SO, after washing, you come back to the scene of the crime to clean up your cummy mess, but there is literally nothing there. You just shot a mystery nut.
"I shot this load over my shoulder, and I know it landed somewhere behind me, but I can't find it! It's gone. I've felt everywhere."
"Bro, you just shot a mystery nut."
The African Nut is where a crowd of black peoplepull their dicks out, clamp it and violently skin their ball sacks and tip of penis with a sharp blade or knife.
Guy: yo wanna try some african nut
other Guy: sure dude sounds like a good time