When a male, preferably after sex, stands before a kneeling female, whom he preferably just had sex with, and cums on both of her shoulders before declaring her a "knight of the white table." The more cum used, the better.
Male: "Yeah, I brought her back, fucked her, then white knighted her."
Friend: "Ah, always great to see a new addition to the white table. White knighting for the win!"