When you've met a new female friend and bought her back to your place/hotel, after failing to score she takes a huge dump in your bathroom before saying goodbye and leaving.
Guy 1: How'd last night go? I saw you leave with her!
Guy 2: "Man, I thought I was certain to score, she got back and then said she was freakin' tired. What made it worse was she left me a fucking Puerto Rican Chili Bowl!"