A term used when you hold a towel over another person's face while they try doing a sit-up. With the towel covering their eyes so they cannot see, another person stands over the blindfolded person with his pants down. While the person is struggling with the sit-up, the person holding the towel lets his grip loose. This will allow the person to successfully complete his sit-up, with the suprise of ending up with his face in the other person's sweaty ass!
Man, we gave Steve a Brown Onion last week and he's still smelling that shit!