look up any word, like hipster:
 
1.
I gathered some facts about them:

Ninja don't sweat.

Bullets can't kill a ninja.

Ninja invented skateboarding

Only a ninja can kill a ninja. Regular humans are useless.

Ninja never wear headbands with the word "ninja" printed on them.

Ninja can breath underwater anytime they want.

Ninja can change clothes in less than 1 second.

Ninja don't smoke, but they do use smoke bombs.

Ninja always land on their feet. If they don't have feet they will land on their nubs.

Ninja invented the internet.

Ninja don't eat or drink very much, and they never have to go to the bathroom.

Ninja always move to America when making a new start as a non-assassin.

Ninja don't play sports. Unless killing is a sport.

Ninja can crush golfballs with 2 fingers, any two fingers.

Ninja have a bad temper when they lose at anything. They will usually cut off the winners head before they have time to gloat.

Ninja lie all the time. Even when the truth serves better, ninja will lie anyway.

Ninja swords are always straight with a square handle guard. Always. Curves are for girls.

Lack any personality

Wear headbands

Fight skillfully with any object

Can remove a spleen in one swift motion

Live in your house secretly for days

Can remove their shadow if needed

Hurl shurikens

Go anywhere they want instantly

Catch bullets in their teeth

Kill themselves if they make a noise

Can run 100 miles on their hands

Train 20 hours/day starting from age 2

Have cool words like Seppuku

Are masters of disguise

Can hover for hours

Flip out and kill everything

Are completely self-sufficient.

Split planks vertically with their nose

Can hide in incense smoke

Kill people.

Ninjas are the best guitar players. Ever.

Ninjas do NOT wear spandex.

A Samurai is NOT a ninja.

Dragon Ball Z characters are NOT ninjas.

If you see a ninja, he is NOT a ninja.
Some guy: "Ninjas are totally sweet"
Some other guy: "True true"
by sam paulin August 12, 2005
 
8.
1.) verb: to take something that rightfully belongs to someone else, mostly in MMORPGs, such as wow; to steal
2.) noun: a player who practices ninja-ing against other players.
1.) "That jerk ninja'd the Assassination Blade, even though I won the roll!"
2.) "Don't group with that guy, he's a ninja looter!"
by Beleynn September 12, 2005
 
9.
A non-word used by people who don't know that:
1. There are no plurals in Japanese and
2. Pluralizing Japanese nouns makes them sound like verbs.
Wrong: Ninjas are always fighting.

Right: There are about 8 ninja surrounding us.
by Zhaleskra March 10, 2007
 
10.
Ancient Japanese warrior, well trained in the art of stealth. Some tools of the trade include shuriken, swords, daggers, and knives. Ninja were part of a clan.
by Mad Walrus September 21, 2002
 
11.
Mammals who fight all the time and whose sole purpose in life is to flip out and kill people.

Natural predators with only one enemy in nature, namely Pirates.
"Holy crap, that ninja is sooo freaking sweet!"
by dragonxero February 25, 2005
 
12.
A word used to avoid using the word nigga.
WTF are they doing, them ninjas is crazy!
by LittleDintheD April 01, 2007
 
13.
Adjective.

Basically another word for cool. Except cooler, as its the word Ninja. Similar to badass in defintion yet far more badass, i think the best explanation of this word is infact 'Ninja'.

This is going to happen. It's Inevitable. It's going to happen big.

It will grow and spread across the Internet like wild fire with a shuriken.
*Roundhouse Kicks someone through a wall*
"Woah that's so frickin' Ninja!"

*A very nice hat*
"That hat is so Ninja!"

*Walks on the grass when there is blatantly a sign with clear instructions not to*
"Shit, that dude is ninja."

*Prefers Pirates*
"What a queer"
by ThatNinjaguy November 14, 2009
 
14.
v. the act of stealing, swooping, or snaking something. usually the person who has been ninja'd upon does not realize it for a little while, and then they are mad when they find out that something of theirs has been ninja'd.
Hey man you ninja'd my chair. Why the hell did you ninja my book, Jordan?
by CPepe September 20, 2005