The interaction in which a male ejaculates into the bleeding vagina of a woman in her menstrual cycle, stirs the blood and semen with his finger and/or penis, and then lets the resultingly pink sauce drip into a shotglass. Afterwards, the male will quickly drink it.
John: "Hey man, you were up late last night with Carla, huh?"
Stephen: "Yeah, we were having some wild sex, but then she had her period."
John: "Oh, that sucks. Couldn't finish then, huh?"
Stephen: "It's all good. She let me take a Shot of Pepto anyways."
John: "That's fucked up man..."