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to partake in the actions or activity of being a ninja. This includes sneaking, hiding in shadows, travelling on foot via rooftops, scaling buildings with a rope or grappling hook attacking/killing unsuspecting victims, using cheap tricks to evade and confuse.
1. "At night, I ninje."

2. "Where's Mike?"
"Oh, he's ninjing across town."
by Matt-a-tat-tat November 26, 2007
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