1 definition by Beatbit
When a bowel movement is so strong that fast moving, high-pressured fecal matter hits the water and some poop splashes back into your asshole.
"Fuck dude, I just did a blast in there"
"OMG Jennifer, I'm doing a blast in the bathroom right now please bring toilet paper"
"OMG Jennifer, I'm doing a blast in the bathroom right now please bring toilet paper"
by Beatbit February 24, 2017