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1.
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.
Steve was filthy because a Hippo had just finished muck spreading on him.
by liberalsuckforever2014 May 10, 2014
 
2.
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!"
by Ozzer Onzer April 24, 2006