ONE WHO CANT SEEM TO KEEP HIS/HER MOUTH SHUT OR KEEP A SECRET TO SAVE HIS/HER LIFE!!
DID YOU HEAR ABOUT BETH GETTING AN STD FROM JOHN? YEH MICA AND HIS DIARRHEA MOUTH TOLD EVERYONE IN THE ENTIRE SCHOOL!!
by MARVELOUS INSANE CRAZY AMAZING November 11, 2008
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A person, who usually isn't very intelligent, who will not shut up. It's typically a cover for their own inferiority.
Damn, shut the hell up dude. You sound like Dabo Swinney with all that diarrhea of the mouth!
by C-dog73 June 15, 2012
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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 July 11, 2008
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The inability to control what words come out of your mouth. Wether they be harsh or not
Bro i just had mouth diarrhea i told erika that she was a slut
by Miss. Mayhem017 September 5, 2019
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When someone won't STFU and keeps blabbering their inane chatter.
See RuffBuff.
by All of RedOut.org September 25, 2003
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constant talk with no information value. unstoppable talking. saying alot but saying nothing at all, not to be confused with saying alot by saying nothing at all. meaningless and unstoppable talk. drug-induced chatter. politics. barf.
That girl has a serious case of diarrhea of the mouth
by Tomsoma March 22, 2003
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