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1.
Pink Ninjas are stealthy, and strike without warning. They are experts at concealment, until they become overly excited. Typically 5 1/2 - 6 inches tall and with prominent veins, they are accompanied by their two faithful hairy companions.

Alternatively, another name for the penis.
The pink ninja slipped into the bushy undergrowth.
by oxford english dick March 26, 2009
 
2.
Some may call it an alternative to the word "penis"; however, let us think for a moment upon the implications.

Pink Ninja is stealthy and covert....making it's way in unnoticed....this is not a positive thing.
When he deployed his pink ninja, her response was thus, "Is it in yet?"...
by IDidItFortheLulz November 15, 2013
 
3.
whisker biscuit, womens reproductive organ, something men love to battle with, vagina
Tom went to his girlfriends house to battle the pink ninja!
by Paige2 July 28, 2006