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1. A release of excrement from a faulty or overloaded child's diaper.

2. A term used to describe a fart that has escaped all attempts to keep it contained under a comforter or blanket.

"It was a real nightmare, we had a major containment breach, our boys diaper failed to hold and we had to throw out his pants."

"Hold your nose there's been a containment breach. I could not hold it"
by nycesq February 23, 2009
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