A voluntary paralysis caused by a tightening of the butt cheeks to prevent defecation.
Standing perfectly still while holding it in so you don't shit yourself.
Caught in a chat-trap, Adam spent the next painful 30 seconds on the stairs clenching and plotting his next move.
After unsuccessfully chat-trapping on the dance floor, Eve would not be able to return the slacks she purchased only the day before.
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