The act of making vigorous, emphatic love to a woman's mouth as she lays on her back and hangs her head off the edge of a mattress, couch or pickup truck bed (perhaps at a Busch League Nascar race). The man moves in a reciprocating, forceful, pile-driver-esque fashion. He may face in any direction he chooses. The goal here is to degrade, humiliate and / or hurt the woman in question in a hate-fuck type of way. Commonly used in pornography as a way of emphasizing the elephantine proportions of the porn-stud's blood-sausage.
Weel, I was plowing maw in the F-150 after the funny car set and that damned bitch Sally stabbed me with a broken bottle when I bust in her eyes.