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mouth fart

The sudden expulsion of air that shoots through your closed lips when someone says something really funny or really stupid.
Bimbo: I think I'll run for president
Normal Person: Pfbtpfbtpfbt!!! You just made my mouth fart.
by mouthfart April 17, 2006
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mouth diarrhea

The act of saying something completely inappropriate unintentionally. This is for scenarios where it is greater than mild word vomit and happens with more information that has somehow fallen out of your mouth.
Girl 1: I don't know why Jordan has been acting so weird. It's probably because he loves me and is feeling embarrassed about it.
Girl 2: It's because he slept with me. And he thinks you're crazy. And annoying. And he is scared that you will like, kill him if he says anything. And he's been cheating on you with practically everyone we know, for like 2 years. Oh crap, I didn't mean to tell you any of that. I just had mouth diarrhea.
by PLBB782 August 4, 2008
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Mouth Muffs

When one must refrain from the use of profanity due to small children in the vicinity.
Dude theres children here, use your mouth muffs.
by Flawed Philosophy October 8, 2009
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Mouth Breather

A person who breathes through their mouth, thus having their mouth hang open. Their mouth can be anywhere from barely open, to gaping, and usually the more open it is, the more idiotic, and unintelligent they look. Mouth Breathers may or may not be intelligent, however, due to the fact that they don't realize their mouth is gaping, they just look like a moron, who may drool at any moment, but is deffinately sucking in as much air as possible.

Mouth breathers tend to be people who are bored, zoning out, very focused on something, someone with huge lips, or someone who isn't smart enough to realize their mouth is hanging open, catching flys. All tend to appear as the latter.

People who are sick and can't actually breathe through their noses do not count.
Katie: "I was sitting in class, and I looked over at Fred, who was staring dead eyed at the board with his mouth hanging open, like an idiot"

Rachel: "Ew, what a Mouth Breather"
by JelloLove September 15, 2010
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MOUTH HUGS

performing oral sex on a penis.
My girl gives me great MOUTH HUGS!
by Mike and April January 11, 2008
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mouth tweet

Public information exchange conducted verbally (by the mouth) in less than 140 characters and complete with web-based acronyms and abbreviations like WTF and Np (No Problem). Once refereed to as "chatting" before the craze over the mouth tweeting platform went viral in early 2011.

Chit-chat 2.0
Jenny: I guess everyone is meeting up at Henry's later. Billy mouth tweeted "Bee Tee Double U - HH @ Henrys"

Ian: Oh cool, thx for the RMT (re-mouth tweet)
by Zaggle Nob March 17, 2011
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mouth fag

Smoker poser who mouths(doesn't inhale) his fags(brit for smokes).
- Jack is a mouth faggin butt pirate!
by Asli-Badmash April 25, 2011
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