A guy who seems nice, but then turns out to be a dick in the end.
Girl 1: Hey what happened? I thought you were in a relationship.
Girl 2: Yea we broke up because he ended up being a Ninja Dick.
by shorewhore1984 August 01, 2010
5 Words related to ninjadick
verb

to stick ones penis into someone else with the advantage of speed, surprise and stealth
"dude, i ninjadicked your mom in the shower last night"
by mr. dickerson May 18, 2007

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