The goose bumps you get after taking a really good poo.
I just dropped a huge D, and now I have poosebumps.
n: The horrible goosebumps you get when you have to take a bad shit and there is no place available to drop it. Often happens whilst sitting in a classroom, board meeting, the line for a roller coaster, or while being pulled over for driving too fast (because of said eminent load spatter).
You could tell Jim had to crap during his canoe trip, he had poosebumps all over his body.