A synonym for writer's block, only more extreme. Where one cannot think properly due to many things: insomnia, nightmares, under-disgested hummus, brain farting and many more serious reasons such as amnesia.
Person 1: What's 2+2?
Person 2: Uhh...34?
Person 1: ...what?
Person 2: Sorry, I'm suffering from mental constipation
by alstarryn January 05, 2009
An inability to articulate one's thoughts or ideas, resulting in significant psychological distress and frustration.

Typically, this form of cognitive impaction is self-resolving. However, in cases where productive interchange with the afflicted is urgently needed, a deadline may be administered; indeed, this has proven to be one of the most effective treatments for stubborn cases of mental constipation.
Mark: "So, you know, it's like... uh, er... damn, you know, that, uh... thing!"
Dave: "Yeesh. It's too bad that they don't make a laxative for mental constipation!"
by Joshua B. Wright April 05, 2004
Inability or unwillingness to express one's emotions. Creates the impression of a cold or unfeeling person. Often associated with having an anal personality. High doses of alcohol are the best known remedy.
He's got such a bad case of mental constipation, if he ever did say anything, shit would come out of his mouth!
by Robodok December 05, 2007

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