The act in which a male, during 69, ejaculates on his partner's face and then immediately flips her off of his body. He must then immediately grab a handful of glitter (which he had in his hand, pocket, or on the bedside table) and "cast" it into his partner's face. The glitter will adhere to the partner's face, leaving her "under his spell". The male can then, if desired, yell "EXCALIBUR!" at the top of his lungs.
"So how was it with Gabi last night?"
"Oh man, she had no idea, I pulled off the Upside-down Merlin. That bitch is totally under my spell."