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A tough and difficult challenge that involves personal risk and you need to be skillful to complete it.
Often entails suffering a degree of pain.
The scene: A shear crag with rocks and the sea below.

Dave: Come on Peter lets go scuba diving down there.

Peter: Are you crazy? We'd need mountain gear to climb down plus all the that scuba gear weighs a ton.

Dave: No we don't man, it'd be a true ninja test for us!
by Groove Rider October 14, 2008
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