Ninja Run 

The act of roadie running with arms out-stretched in an absoloutly flawless attempt to make the run quieter, and increase velocity significantly. This takes prolonged practise, but when mastered is more effective than possibly imaginable.

"Holy shit, the cops just rolled up! Quick everyone Ninja Run the fuck outa this joint!"

"Omg i was nailing this chick last night when her parents walked in, so i had to naked Ninja Run all the way home!"

Ninja Run by Ninja Jamie June 30, 2009

Ninja Run 

The act of defying buoyancy by lowering your body with arms parallel to the ground beside you, and running along the ocean floor at unbeatable speeds, for amazing distances. Only talented bosses can ninja run correctly.

'Hey bro nice ninja run!'
"thanks man'

"ebony! excellent ninja run!'
"cheers"

Ninja Run by rosebudp January 17, 2013

Ninja runner 

Most often used in the running community, it describes a person who likes to run while wearing all black.

The ninja runner darted across the dark road, barely escaping certain death from an oncoming tractor trailer.

Ninja runner by The Logophile May 4, 2010

ninja bear runner 

A variation of the common childhood game “rock, paper, scissors”. Ninja kills bear, bear kills runner, runner runs past ninja. Therefore, ninja wins over bear, bear wins over runner, runner wins over ninja.

While playing pool, the break was determined by ninja bear runner.

⚔️🐻🏃🏽 ♂️

ninja bear runner by Sweet Tits with a K March 26, 2019

I'm running Ninja 

In reference to Call of Duty games, it is a fancy way of saying "Nobody will hear me" when you are sneaking into or out of a house or other building you weren't supposed to leave/enter to begin with.

Buddy: Dude, are you seriously going to come with me later? Won't your parents hear you?

You: Relax, I'm running Ninja up in this biatch.

I'm running Ninja by AL_PS3 March 2, 2011

I'm running Ninja 

In reference to the Ninja/Ninja Pro perk of the CoD games. It's basically a fancy way of saying that you don't have trouble being quiet/sneaky.

Most often used when your friend is worried about you making noise when sneaking out of or into your house.

Teen 1: C'mon man, let's go!

Teen 2: Did your dad hear you?

Teen 1: Relax buddy, I'm running Ninja right now.

I'm running Ninja by AL_PS3 February 27, 2011

Rune Ninja8 

A RuneScape nerd who completed RuneScape in a year and always fails to get hilts.

Rune Ninja8: FFS MY FUCKING HILT

Rune Ninja8 by Jess| December 13, 2009