Clamina is the extreme strength of the vagina clutch. The ultimate in muscular grip, commonly known to dislocate and or "snap" a penis. Alternatively, it means..the stamina of your clam.
"Yo..I was fuckin' with this chick last weekend..and she had the illest Clamina I have ever witnessed in my entire life.."
"Clamina, bro?? What do you mean?"
"Man, her pussy was so tight and legitimately had the ability to break my dick in half if she wanted to..plus, that pussy was down for fucking at all hours of the day & night. Illest.