black ninja 

black ninja is the remnants of roaches stuck in a freezer bag. After you take out and smoke all the roaches there is a black substance at the bottom of the bag. This is called black ninja. Because it's black and it kick's your ass like a ninja.

Dude, take out some of that black ninja and sprinkle it on top. It'll get us really high.

black ninja by Dugan May 6, 2005

black.ninja 

attempt for steve to feel important in life...

steve: hey guys did you read my definition of black.ninja on urbandictionary.com?
Heterosexual male #1: no who the hell are you
Heterosexual male #2: faggot

black.ninja by Steve is a Faggot November 18, 2004

black.ninja 

extreme backside, with an attitude to back it up. She saves lives by day, and cooks at night. the most ghetto gurl in beaverton. Leave her ranch on the doorstep, and she will leave you alone. like a boogie monster she is. she is fANHtastic.

black.ninja moves in slow motion in the halls.

black.ninja by steve November 3, 2004

Super Secret Black Ninja 

Rarely sighted in the Poughkeepsie area, Super Secret Black Ninja or SSBN for short, has madd nasty creepin skills and has the ability to fly and pull super secret sneak attacks on unsuspecting citizens. Can be seen with 005.

Oh Shit! Was that Super Secret Black Ninja over there by that pole? Lets book it out the Double Secret Probation way...

Super Secret Black Ninja by Super Secret Squad March 22, 2009

Black-Belly Ninja 

A nigga who know how to do them Kung-Fus real good. He got a black belly because he take so many punches right in the gut. Real strong nigga.

That guy is a Black-Belly Ninja dawg.

Black-Belly Ninja by BlackBellyBoy June 19, 2018

Ninja Gaiden Black

The video game equivalent of natural selection.

If you're one of those whiny adolescent morons who threatens complete strangers with violence over Xbox Live despite the fact you haven't even got hairs on your chin, don't play Ninja Gaiden Black. The sudden jolt back to reality may annihilate you.

Ninja Gaiden Black by Muttering Master March 8, 2007

Back-line Ninja 

A Mcdonald's employee who lies about having a black belt or any martial arts training other than playing Mortal Combat or watching Bruce Lee films.

Crazy Dave is a Back-line Ninja.

Back-line Ninja by Big ole Bastard July 5, 2009