Top Definition
"what appears to be a guitar except that it can only be played by trained assassins. It is so electrifyingly rockin' that if you aren't a ninja, your head will explode."-Ask A Ninja.

Or

what you call a person that plays guitar so awesomely rockin' that they have to be a ninja to play it.
CJ was jammin' out on his ninjatar. he must be a ninja!
by Secret Justin June 02, 2007
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