To spill out any thoughtless, boorish, insensitive, indiscrete, or brainless crap that comes to mind without being able to exert any control, restraint, forethought or prudence. To talk out of one's ass.
Sorry for what I said about your wife's booty at the meeting this morning, man. I don't know what I was thinking. I must have had an episode of mental diarrhea.
10👍 3👎