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1.
A crappy purple Saturn belonging to a student
The group of kids piled into Chris Martin's car, the poon wagon, to go downtown for some fun after school.
by AITE_Student June 22, 2009
 
2.
Can be used to describe an automobile that either:

a.) Gets you tons of poon.
OR
b.) A ride that is so beat up that it is a joke.
a.) That kid gets so much poon cause of his poon wagon.

b.) My poon wagon is in the shop again. I hope my mommy or daddy can give me a ride to the mall.
by Col. Pooner T. Corntooth February 21, 2005
 
3.
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.
by BallsDeepInVaseline September 28, 2011
 
4.
A Poon Wagon is the same as a Train. The only difference is that a Poon Wagon is a number of females and only one male.
"Yo son I got poon wagoned last night"
by Martinez53 September 13, 2008