A tendency speak constantly or at length without thinking. I get so nervous every time I'm around police officers that I have diarrhea of the mouth and can't seem to shut up!If you want this to stay a secret, don't tell Mike—that guy has diarrhea of the mouth, I swear.A: "Why are you afraid of the CEO?" B: "Because I tend to get diarrhea of the mouth around important people, and I don't want that to happen with her!"
Fig. constant talking; a "disorder" involving constant talking. Wow, does he ever have diarrhea of the mouth!You're getting diarrhea of the jawbone again.
n. an imaginary disease involving constant talking. Wow, does he ever have diarrhea of the mouth! Sorry. I seem to get diarrhea of the jawbone whenever I get in front of an audience.
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