Top Definition
A mysterious rainstorm that occurs in a ninja-like fashion. You don't hear or see the rain, but you when you go outside you are suprised to find it has apparently rained heavily.

The most impressive ninja rain has been known to occur on cloudless, sunny days-- thus increasing it's mystery.
When I went to my car this afternoon everything was soaked but there was not a cloud in sight.. there must have been some crazy ninja rain!
de MKEtown 14 Iunie 2010

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