The act of cumming such a large load on a fat girl that she resembles a wagon (covered in skeet). This wagon may or may not be very mobile depending on the weight of the chubby. Either way, a skeetwagon is always good for a ride.
Chubby Chaser: Aw yeah dude, I was banging this chubby, and I blew such a big load on her she looked like a wagon of skeet.
Bro: Aw sick bro, nice skeetwagon!