math ninja

–noun, plural -ja, -jas. a member of a modern society of mathematical agents, highly trained in stealth calculatons and number theory, who are hired for covert purposes ranging from solving the worlds problems to passing on their skills to the next generation.

Mr. Harris is a math ninja.

by KSignell February 6, 2010

bathroom ninja

A person who occupies a bathroom stall and refuses to make any BM noises until the entire bathroom has been vacated. Occasionally, a bathroom ninja will even go so far as to stand on the toilet seat to avoid detection by other bathroom-goers.

Jacob hid in the shadows cast by the stall walls like a bathroom ninja until the final shitter had left the restroom.

by timr211 August 15, 2014

Door-Ninja

A person who slips in a door quickly before it closes without touching the door.

That bastard door-ninja didn't hold the door for me.

by TurboTurbo January 10, 2011

Alcoholic Ninja

The one person you always try to,avoid at the bar but he somehow seems to show up out of nowhere and spews his drunk stupidity at you.

My girlfriend and I were having a great time at the bar last night and out of nowhere Pat appears , completely drunk , talking about his latest female conquest. He is such a fucking Alcoholic Ninja!

by Urban humor May 27, 2017

Ninja Tank

In RPGs and some MMORPgs, is another word for a character that can be in the forefront of the battle and survive the outcome due to sheer evasiveness rather than high armor and health. An example would be the assassin from the pseudo-MMORPG game "Guild Wars", especially in PvP mode.

"OMG, why duz teh PVP 'Sin not die? teh whole team is attacking him... I h8 ninja tanks

by BinaryEmperor August 18, 2008

Ninja Chord

Usually played on guitar, but just the same on piano, this is a series of notes that requires the player to stretch their hands out as far as humanly possible.

I can't believe all that Ninja Chords that Al DiMeola played tonight!

by Matt Wrong April 20, 2011

Infinity Ninja

1. A lemniscate (AKA the infinity sign, or a side-ways eight) that looks like a ninja. Once you see one you'll start seeing them everywhere.

2. The most powerful ninja in the world, one who can control time, destroy the universe, etc.
What's more, HE'S EVERYWHERE. Look at your keyboard sideways, between the 7 and the 9. He's there, looking at you.

1. (tilt your head)

8 ----> (8)X-< It's a ninja!

2. Ninja 1: He's too much for us....
Ninja 2: Where did we get the idea that we even had a chance? There's a whole army of them now......
Infinity Ninja: ∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞

by MisterDot December 21, 2010