A sexual act where the male ejaculates into the mouth of his partner, and then the partner blows the sperm into the rectum of the male.
Guy 1 "I want a creampie from that girl"
Guy 2 "How is that possible?"
Guy 1 "I don't know"
Guy 2 "Wait...I got it"
Guy 1 "That's one of the most horrible things I've ever heard...let's name it Mouthful of Marcus"