The mess that occurs when a hippo takes a shit, but rather than allowing the shit to drop from it's anus, it presses it's tail against it's ass crack, waving it back and forth, spreading the shit all over the place.
"I'd rather press my face against a hippopotamuses butt while it muck spreads." - Angry Video Game Nerd
by cheez_man_person March 7, 2010
When a Hippopotamus takes a dump and waves its tail rapidly to shred the fecal matter as it exits the anus, leading the fecal matter to spread all over the place.
by liberalsuckforever2014 May 11, 2014
Muck Spreading (verb) - The jetison of spent semen from your partners anus by means of farting or shitting or both at the same time.
Tracey spread her butts and farted the spent muck right back onto my Japs Eye.
"Bullseye, you Muck Spreading bitch, I grunted!"
"Bullseye, you Muck Spreading bitch, I grunted!"
by Ozzer Onzer April 24, 2006