Ninja-Signing

When an author secretly signs his/her own books in a bookstore without the bookstore's knowledge.

Brandon Sanderson is ninja-signing books in airports.

by jackatthekilns November 10, 2009

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 September 4, 2015

Ninja Face

The art of using face unlock on another person's smartphone without their knowledge. Usually performed by a child from some sneaky angle while distracting the parent with other matters.

She keeps using Ninja Face on me to watch that stupid YouTube channel

by PatTheChat June 8, 2019

ninja turtleism

a belief that the 4 ninja turtles are really the 4 horseman of the apocalypse

dude u goin to the ninja turtleism benefit tomorrow

by marceld April 2, 2010

Stink ninja

Pulling up ones shirt over ones nose while using a toilet facility to avoid the smell of the previous user

Jason walks into the bathroom after adam has shit and thinks "GODDAM THIS TOILET FUCKEN STINKS, TIME TO DO THE OLD STINK NINJA" pulling his shirt up over his nose and thus finds urinating at work bearable once more. True story

by raymonty January 22, 2012

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

nagger ninja

A human being having the power to know everything about anything. They also have supper strength. They are not able to fly because no Ninjas are able to fly, thats just crazy. They are normally found with curly hair and are full blood jewish. The way you know if you've really found a real life Nagger Ninja is by them presenting legal documentation of a black belt with their name on it. Nagger Ninjas can be very dangerous, DO NOT approch them if you are half cuban and half bosnian.

OMG, i just saw a Nagger Ninja fly!

that would be a perfect example of something crazy.

by Ninjanagger December 25, 2010