A sexual act whereby a man, having dated a woman for some time, relates that his greatest fantasy is to fuck whilst she is pressed up against a large window, such as a sliding door. When the act inevitably happens, the dude whispers in her ear that he is going to finish off in her ass. He withdraws, and at that moment, his friend, waiting in the shadows, emerges and inserts his dick into her ass. The original man then slips out a side door, walks to the front of the window, and waves at his soon-to-be ex-girlfriend. She'll wonder how the fuck you pulled that one off.
I found out that my girlfriend cheated on me, so my friend and I pulled a Siegfried and Roy on that dirty bitch!