When a man goes to a bar and finds the fattest, ugliest female there. He then takes her home and proceeds to have sex with her. Right in the middle of intercourse, he tells her that she is the fattest, ugliest bitch he has ever met. He then tries to stay on or "ride her like a bucking bull".
Riding the rodeo can result in the loss of your scrotum.
An army buddy told me this definition. When you are having intercourse with a dead woman and need extra lubricant you punch her in the belly and the fluids from the abdominal cavity stream down into her vagina.