Merriam-Webster

Pearl necklace: the glorious culmination of tit-fucking, in which you blow your nuts out all over a girl's tits, shoulders, neck, and, with any luck, chin. one of the highest expressions of love and affection bestowable upon a woman by a man.

Example:

Dashing Gent: Hey, I bet you'd look good in a "pearl necklace."

Big-Titted Dreamboat: Why, yes, I supposed you're right. Why don't you come on over to my place and baste my torpedo tits and elegant neck with your steaming hot man goo?