What is Sea Urchin?
1.
The act of sticking your finger in someone's butthole and it clinches up like a Sea Urchin does when you poke your finger in one. Particularly effective if you say "Sea Urchin" as you make the move.
Ha! Stacy was bending down to grab her purse and I gave her a sea urchin.
2.
A form of making love under water in a replica of a giant oyster, without a breathing aparatus. Frequent breaths are needed in order to stay alive.
My lover and I were engaged in a very dangerous, but erotic, sea urchin.
See
3.
To have sex with a woman with the intentions of hurting her feelings.
Timmy was being really nice to Claire, but I have a feeling that he is going to "sea urchin" her
