Ninjaken 

Americanized term for the traditional long sword of the ninja, historically shorter and straighter than the katana carried by samurai of the time. Usually of very low quality.

"My name is Shinobi-Ryu. Move your f***ing car or I will cut you in half with my Ninjaken."

Ninjaken by Austin Smith August 10, 2006

Ninjaren't 

Noun: Anyone who is not a Ninja
Adjective: Clumsy, self-percieved as cool, slick, or fast when in reality a tool

Hey, Im cool, like a ninja! No man, youre not, youre more like a Ninjaren't.

Can also be used as an adjective "Youre way more Ninjaren't than Ninja, dumbass"

Ninjaren't by Annabella_Annabella May 4, 2011

ninjaengineer 

1. Highly trained black ops personnel adept at breaking and entering and demolitions and hand-to-hand combat. Usually found only in movies.

2. A software engineer or IT person who comes into the office after hours in order to disable employee monitoring software.

I felt like a fucking ninjaengineer last weekend when I disabled my boss' fucking spyware.

ninjaengineer by cutelyaware November 16, 2010

ninjapenguin 

The most powerful force on the planet, only one holds the title of NinjaPenguin.

I saw the NinjaPenguin today, His name is Jayde.

ninjapenguin by Ninjapenguin December 17, 2013