a sexual or romantic bandwagon; to be on the poon wagon means to be in a relationship or simply getting tons of ass. Typically a phrase used towards males.
Rodney: Hey man you've been hitting on her for weeks, just hop on the poon wagon already.
A device to keep poop from smearing on the bottom of the toilet. It carries the poop along the toilet and down smoothly without leaving traces behind thus eliminating any evidence. The poopwagon is accomplished simply by placing a long strip of toilet paper in the water vertically before pooping.
I rode the poopwagon in the bathroom because I didn't want anyone at work to know it was me who had just pooped.
The object of one's sexual desire/frustration who lends to the overall dramaticplot 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!