Ninja Out 

To sneak out of place without anyone knowing.

To leave a place early without saying bye to anyone to avoid them making you stay

I don't want to drink anymore so I'm going to ninja out before anyone notices.

Danny always tries to ninja out early because he cannot hang.

Ninja Out by LW0WW May 25, 2011

bust out ninja skills 

to win a fight in an unorthadox yet very effective way

Did you see Matt bust out the ninja skills on Jim? I saw his brains and everything!

bust out ninja skills by Adrian Salazar May 9, 2005

ninja it out 

when in a tight situation, solve it in the most ninja like way as possible.

dude, chris was about to get capped by niko, but it he was able to ninja it out and it was cool.

ninja it out by servant of the boognish November 6, 2009