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The act of tieing a black t-shirt around your head and pretending to be a ninja hiding behind walls from cars and climbing on buildings.
Im going to ninja the village and steal a prize from (insert name here)garden
ninjaring by Daniel Read June 5, 2005

ninjabrick

ninjabrick = Japanese fangirl
What's all that Pokemon, Final Fantasy and Domo-kun fangear around in here? - It must be ninjabrick's room !
ninjabrick by sundayx September 17, 2008

Ninjafrank 

Ninjafrank is a type of ninja. This special type of ninja uses the ninja powers he has by harrassing various people and causing humorous camotion. Without Ninjafrank one's life is dull and has no real meaning. Its depressing..:D
Jr:I was running down the street and Ninjafrank came over and poked me with a frenchfry, Now i'm greasy!

Sr:get over it
Ninjafrank by 00bananahead March 27, 2009

NinjaBrick

A helpful or nice person dressed in the attire of a ninja (14th century assassin originating from Japan).
Who is that masked nice man? Must be a NinjaBrick...
NinjaBrick by Ninja Brick January 18, 2003

NinjaBeans 

When a situation is ridiculously awkward, ninjabeans is the safe word.
Some bitch - "So ya i like to shave my back hairs like this.. wanna help?"
Friend 1 - "NinjaBeans!"
Friend 2 - "Well we'd love to help but i gotta go cut my dick off..."
NinjaBeans by KrizlySon January 8, 2011

ninjarai 

The combination of a ninja and a samurai. Having the stealth and cunning of a ninja combined with the quick-draw techniques and stronger attacks of a samurai.

Dood, that ninjarai just totally ninjapwned those lamers!
ninjarai by Necro_EX June 11, 2006