Formed from 'mucking out' or cleaning the poo from livestock dwellings.

However, more modernly, it is in reference to laying the hammer down on a big babe's butthole. Hence, cleaning the poo from her balloon knot.
Me: Goddamn it, Bernice is lookin good over there.

Friend: you won't muck out her asshole.

Me: you think I'm scared to muck out Bernice? Fuck you pal. I bet I could muck her out so hard she loses 5 lbs... Then I do it
by TittyfaceJenkins June 30, 2021
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After you take a shit and wipe your ass you think it's nice and clean only to find out theres still some more in your o ring.
by soup bone September 21, 2013
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A way to explain that you’re eating. Usually something that will make you full.
“Hey Dave do you want to go get tacos?”

Yep im ready to muck the barrel”
by Donald S. Duck January 04, 2018
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referring to a mans cum.
“went out last night, brought a girl home and chucked my muck up her”
by elliehainesxxx June 03, 2019
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Today the 23.04.2018 is national Muck-Day!
While in a group people you like you are allowed to continously offend them. They are allowed to counter-muck as long as it does not overwhelm the original muck.

On National Muck-Day you can muck as much as you want. Usually mucking is something special you do on occasions that make the muck funny, but on NMD the muck is life. Muck all day!
National Muck-Day!
me: Damn! It's national Muck-Day! Let's see... Yo Max! You're Gay!
Max (with the rules off NMD in mind): Yo, You're a Bitch!
by Clarencexz April 23, 2018
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A phrase used by Stephen King in 'Under the Dome' a more PC way of saying cluster F&%$!!!! discribes a situation like FUBAR or SNAFU
the snoclops guy..roch ny
after 911 the airports have turned into a cluster muck!
by snoclops June 13, 2012
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