New York Crust
When a guy is plowing a girl from behind, busts on her back, and writes his initials in the cum with his finger. Once dried, his initials will be printed in the crusty jizz canvas.
Hey bro, when I was banging my girl this morning I went to give her the ol' New York Crust. But before I busted, I looked down and discovered someone with your initials had already done it...