Muckmouth 

Someone who swears a lot.
Can also refer to semen in the mouth of a girl (or boy).
Also a skateboard magazine based in New Zealand.

Alex was wanking in the bath and the jizz landed in his mouth. Bloody muckmouth.

Muckmouth by nobjockey101 October 28, 2008

McFoot in McMouth 

The ability of John McCain to continuously fuck-up what he is talking about - even on the basic things that he is running on.

An example would be when John McCain caught McFoot in McMouth disease and tried to redefine what a surge was because he could remember when it started and accidentally claimed that it started a year before it actually did.

McFoot in McMouth by Cindy McCain August 20, 2008

yuckmouth 

1970s era commercial jingle about the need to brush your teeth to avoid tooth decay

They call me Yuckmouth
Cause I don't brush
No I like my teeth like this

They call me Yuckmouth
Cause I don't brush
How's about a little kiss?

Got some beef in my teeth
Got some chicken too
Ouch! That's a cavity
Hey, that's new!

Well if you don't brush your teeth
Then yes, you too
Will be a yuckmouth

Don't be a yuckmouth!

yuckmouth by gammarock April 15, 2005

Mushmouthian 

A persons, after imbibing in too much alcohol, who has problems speaking common words, phrases or sentences clearly or audibly. Usually the words come out slurred or several words may be linked together to form a new random word.

When I was at a party one of the people had so much to drink they spoke Mushmouthian and noone could understand a word they were saying.

Mushmouthian by Maidenhawk July 7, 2009

fuckmouth 

Noun. A person with whom you are displeased.

Watch where you're driving you fuckin' fuckmouth!

fuckmouth by Johnny Hollywood September 22, 2005

yuckmouth 

ugly teeth, no teeth, halitosis,

Quayshawn- hey that guys breath is off the meter.

Dominique- yea he has a yuckmouth.

yuckmouth by Quayshawn L. Cooper June 9, 2009

McMouth 

The unpleasant film that remains in your mouth after eating fast food.

That McMuffin left me with some nasty McMouth!

McMouth by Stroo April 7, 2010