Massie's Underground Clinic for Kissing. In the fifth Clique Novel, "The Pretty Committee Strikes Back" by Lisi Harrison, it is an important part of the book.
Taken from the back cover, "The Briarwood Boys are staying in a cabin just a few yards away, which means the girls in Massie's Underground Clinic for Kissing (MUCK) might have to find the guts to put their money where their well-glossed mouths are."
by JennaQ April 14, 2006
Ugly beyond all reasonable doubt.
That booty claps, but she fuckin muck!
by Z money cash $ fast $ slow $ September 12, 2009
(v) In poker, to return your cards to the dealer without showing the other players. Differs from fold because folded cards cannot be shown during play (forced muck). Muck implies choice.
He mucked his cards so I couldn't see if he was bluffing or chasing.
by Coell May 12, 2005
verb - To be on pills of any kind. usually ecstasy
John: Weren't you muckin that day?

Tom: Yeah, it was fun.
by contagion; September 12, 2009
Universal verb for any action

To muck = to do
This guys muckin jeans and a hoodie.
Lets muck McD's before we muck outta here.
Its friday, course we're muckin Winston's tonight
by emmber March 20, 2011
mucks is another word for magic mushrooms. and mucking is to be on them.
ex. those are some tastey looking mucks
ex. holy shit, i'm mucking.
by EssTeeEye March 05, 2005
to screw up
he mucked up his driving test.
by TerMInaTER September 05, 2003
to do something
" muck that chew kid"
" just muckin some box"
" lets muck that za"
by the mucker June 29, 2009

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