Ninja-Signing

When an author secretly signs his/her own books in a bookstore without the bookstore's knowledge.
by jackatthekilns November 11, 2009
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Ninja Lag

The warping of time and space so that a real event happens after it theoretically should
an example of ninja lag, in anime is when swordsmen or ninja slash their swords at each other, sometimes they have time to put their sword back into the sheath and walk away before the other person is actually cut by the blade.
by Sweaty man in your 7th period September 15, 2009
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Ninja Proofing

Setting up your house to ward off long term ninja infestations. It's considered impossible to keep ninjas out entirely. In fact, attempting to do so can attract their attention and just make the problem worse.

1) Coat the walls and ceilings with steel backed teflon. If the steel isn't thick enough, they can still use their claws. Make sure it's at least a 1/4 inch thick.
2) Install random rotating magnets. This makes it difficult to throw shurikens accurately.
3) Set up a DVD of old "Kung Fu" reruns in infinite reply. Warning: This may cause Seppuku incidents, which are really messy. Take my word on it. Spread plastic in front of the TV.

Avoid using pirates. I know it's tempting, but they're worse than ninjas (really loud and smelly and treasure chests are hard to find).
Bob: Where were you last weekend?
Bill: Sorry, spent all day Saturday Ninja Proofing.
by Al Benedict December 02, 2010
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ninja mouse

A term to describe a person who has the ability to sneak out of tight situations requiring the utmost delicacy without a squeak.
Man! That chick slid out of my bed like a ninja mouse.
by BigPansy January 08, 2016
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Nipple ninja

A person who can grope a females breasts without being caught or causing conflict
That guy is a fucking Nipple ninja
by Nothunterself December 17, 2013
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Ninja bounce

To leave a room of people without saying goodbye. To leave unnoticed, like a ninja.
I was so tired at the party last night, I totally ninja bounced.
by WordsImakeup33 August 02, 2015
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ninjas on the roof

as soon as i walked in on Stacy and Jill and that 6 foot toedo, i knew there were ninjas on the roof! Phil would be pissed.

by freewilly23 January 19, 2009
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