trucker blowout
When you walk into the rest area bathroom and here the funniest, nastiest, noises coming from the stall..... the act of blowing everything out of your ass like an explosion.
I was trying to piss, and all of a sudden, a guy comes running in, slams a door , and before I knew it he was having a "trucker blowout"!!!! I was laughing so hard I couldn't even was my hands.