The hocker is a sexual position whereas a female (or male if you are into that sort of thing) is laying on her/his back on a
bed or other raised platform, with their head falling off the edge, and you, standing insert your penis into their open mouth at the same
time cutting off their
air stream by letting your ball
sac cover their nostrils–as you proceed with a rhythmic pumping motion-which leads to a sound resembling a "hock-hock"