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an imaginary medical problem that is supposed to account for someone talking too much
Man, that guy has a serious case of diarrhea of the mouth. God he is annoying.
by Light Joker January 14, 2005
when one needs to take a shit but it comes out from the wrong end.
I got mouth-diarrhea all over my pants
by bastardized bottomburp March 22, 2003
Someone who can't stop talking.
Joe Shmoe: Billy must have diarrhea of the mouth.
Bob: What do you mean?
Joe Shmoe: He won't shut up!
Bob: Ohhh.
by Bagdaddy May 29, 2006
Spilling your beans nonstop to any and everyone who will listen. This especially applies when you're cracked out or tweaked on drugs and feel the need to share every random thought that crosses your mind.

See also chatty cathy.
"Dude, you totally have diarrhea of the mouth. You need to shut up for a bit."
by ariesjow July 28, 2005
1. Using Profane Language

2. Talking Shit
You have diarrhea of the mouth.
by DaSnoopinatorFoSho March 22, 2003
When you can not stop talking for nothing. When you just go on and on and on.
Mom caught me sneaking in last night. I started lying to her and I just had diarrhea of the mouth.

That lady had diarrhea of the mouth. She would just not shut up.
by Boobralicious July 20, 2009
when you use a bunch of curse words, similar to Tourette's syndrome or when you spread a lot of gossip.
Guy: I can't believe you went out with that asshole. He is such a player!

Girl: At least I don't have diarrhea of the mouth!
by Jaeda June 15, 2008