a mermaid tail
A mermaid tail is when you pass out after sex and your jizz leaks out and sticks your legs together like a glue factory exploded in your pants.
After our third round of sex, my jizz glued my legs together. I looked like a fried chicken with a tail.
My girlfriend passed out after sex and looked like a fried chicken with a tail.
I woke up after sex and my legs were stuck together like a jizz sandwich.