The act of having sex while the guy is on his back and the girl is straddling him in a bed.
When the male is about to cum, he violently picks up the girl and throws her head into the back of the headboard, then cums on her back.
Dating Agency Dude: OK Dude here's your blind date, Rosie O.
Dude1: Holy crap dude! WTF is that!?
Brad(flying over in a helicopter): Here!(drops the rocket launcher) Use the rocket launcher! Kill it, whatever it is!!
Dude1: Thanks Brad!