A girl who rides cock in a very fast, jarring motion akin to that of a horse jockey rapidly oscillating on the back of a steed with hooves pumping into the earth causing a tempestuous rumble in the bowels of the earth.
This is known to cause more pain than pleasure.
Jockeys are often found in their natural environment of a party bus for freshman birthday parties.
Person 1: "Damn, Erin went all jockey on Luke last night on the party bus huh?"
Person 2: "Yeah shit that had to have been painful for him... it didn't even look fun!"