Twat stamp

A tattoo across a woman's pelvic bone, above the vagina or twat.
Like a tramp stamp, but in the front, above the vagina instead of the butt.

Person A: "You know that girl over there? when she has a bikini on, you can TOTALLY see her twat stamp!"
Person B: "Don't you mean tramp stamp ?"
Person A: "No, she has one in the front, too!"