Rick: "Are you and Bethany still together?"
Steve: "You wouldn't think so. I haven't called her in like a week. I even slept with her sister, but that poontangerang keeps peepin' me up!"
The object of one's sexual desire/frustration who lends to the overall dramatic plot of one's own carnal existence. Can be used in fictional or real-life terms.
Stumpy: 'Dat prop Estella Havisham in "Great Expectations" is merely da poontagonist of Phillip; had he shagged dat fine bitch-ass he'd of moved on to all dem ripe artshop ho's who be wantin' on him and wulda neva looked back!