Wet basement mudslide

The act of shitting your pants while sitting then sliding out of your current position like you’re going down a slide.

Man I was so lazy Sunday afternoon. I had to go to the bathroom, but instead of going I just sat on my couch and gave myself a Wet Basement MudSlide.

Wet basement mudslide meaning: shitting yourself while sitting and sliding out of your position as if you were on a slide.