Person 1: yo have you muck her cornhole yet?
Person 2: yeah guy, I have mucked out that cornhole like 20 times, dat shit is clean!!!!
Person 1: naaww I would never muck a cornhole!
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.
Muck Fizzou = Fuck Mizzou, or the Missouri Tigers. There is a big rivalry between MU and KU; Used by Kansas University (KU) Jayhawk fans, and is on some t-shirts.