Phrase. If during the process of deep passion, a male seizes the major role, and arranges his figure fully, and completely on top of the female's. Commonly used to describe the male as the main role, holding complete authority over "what happens next".
"It" refers to the female, and the male is conducting the action, and is pressing down.
Joey was patting it down last night, it was hard not to hear it through the wall.
Tim never got tired of patting it down.