A rarely seen move only properly executed by a particular Capital Law SchoolStudent in which the male ends up sexually satisfied and the female ends up pregnant.
He really twerked her down last night at Sky Bar. I hope he was wearing a condom.
When a girl (if a guy does it its just wrong) quickly contracts and relaxes the lower back muscles, causing the butt to move up and down (and mabey jiggle depending on size of butt) resulting in any surounding guys to yell "Daaaaaaaaamn!"