Buffalo Trot
The act of bending your girlfriend over a table, bed, or couch naked, then standing back 10-15 feet and running at her full force with an erected penis, trying to get it into either her anus or vagina.
Doctor: So, John, how'd you break your penis?
John: Well, I was doing the Buffalo Trot to my girlfriend and missed.
John: Well, I was doing the Buffalo Trot to my girlfriend and missed.