Top Definition
Niina's ass is defined as a commodity that can be cracked by allowing it to free-fall from a zip-line or other extreme sport obstacle. It must not be thrust in an abrupt and impromptu motion and may leave its owner paralyzed for up to 6 weeks.
Niina's ass broke when she fell from a zip-line in camp. Superman's penis.
by ant3ver December 07, 2010

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