Top definition
A person who lacks the common sense to avoid antagonizing ninjas. A social klutz who does not know how to behave in public. Missing hands or fingers is a sure sign, but not required.
I can't believe that you just ate my BK mini burger off my plate, you are such a ninja petter!

You: Let's wait for the light to turn before we cross.
Me: You are such a ninja petter, there's no traffic.
by bravo delta August 15, 2011
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