ninja giggle 

the small nearly unnoticeable laugh a ninja does on the rare occasion when he is caught. Ninjas are almost never caught, hence no one knows what a ninja giggle sounds like.

As the ninja unobtrusively snuck down the high school hallway and the assistant principal saw him, he ninja giggled

ninja giggle by luckyones05 May 6, 2006

ninja pizza 

pizza that disappears very quickly without a trace

ninjas love ninja pizza!

ninja pizza by Gerg Craver October 5, 2007

ninja 

a free runner who is so sick he could just be a descendent of a ninja,
a person who is amazing and sneaks outa no where
the guy who always wins in hide and seek
but is never found

DUUUDE did u just see that guy, i swear to god hes a frikin ninja
dude i hate john he always wins hide and seek AND HE DOESNT EVEN COME OUT WHEN WE YELL GAMES OVER
damn that guys so ninja he drinks salt
outa a sippy cup

ninja by KIZzla February 20, 2009

Spork Ninja 

A Spork Ninja is a mythological creature that is always looking for gold, and is always looking for an unexpected person to not pay attention. They will sneak up behind you, and decapitate you with a spork.

Not to be confused with Spork Sensei

Person#1: Dude! Weak! Something Decapitated Kenny!

Person#2: Ewwwww, looks like a Spork Ninja attack to me...

Spork Ninja by omgykkyb September 24, 2006

brain ninja 

someone who has the ability to get into your head and fuck with your mind.

Jess: We were having a fight bout (something stupid that was Jess' fault) but i totally turned it around and made him feel bad bout it.
Ashlee: wow, you're such a brain ninja jess!

brain ninja by inimitable07 April 4, 2009

Herpes Ninja 

A small, albeit herpes-infested ninja. He comes into your house while you are away and touches EVERYTHING.

Do you ever wonder why your room smells funny sometimes when you come home? That's a sure sign that the herpes ninja has paid you a visit.

Herpes Ninja by Galaxion Shinyshanks September 14, 2009

ass ninja 

ninja's that spontaniously spawn from ones ass.

'Goddam, i had a bit of trouble with some ass ninja's this morning.'

ass ninja by Prycey September 9, 2003