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Fionna Ninja 

A fionna ninja is AWESOME!!!! It is only given to you. The person that has a H in the begging of his or her name is a fionna ninja.

There is also a monkey ninja, THE BEST THINGS IN THE WORLD !!!!!! They are the best climbers and very sneaky😁
Random dude: Helena is a fionna ninja!!!

Another dude: yea!!!

on the ninja 

To get away with something with such stealth and skill that it can only be compared to that of a ninja.

Derived from the term 'on the sly' - To be on the sly, the active of sly. You can do something on the sly, maybe stealing something funny and legendary, like mine and Jimbo's road bollard. You could also have 'slying it'
First guy:
"Hey dude, I looked in the fridge just then and I cant find that steak that I had ready for dinner, Do you know where it went?"

Second guy:
"Not too sure bro, Sam was looking in there before. Maybe he took it on the ninja when no one was looking".
on the ninja by Roarkey May 6, 2008

The Lazy Ninja 

A modified version of the original Ninja - A sex position where a dildo and a Clapper are needed. With the lights off, proceed to have doggystyle sex with a woman then pull-out and stick the dildo in her so she thinks you are still in her. Then with two firm reverberant slaps on the buttocks, the lights will automatically turn on - then proceed to punch her in the face and yell, " I'M A LAZY NINJA!!!".
This is good for all ages - no need to search for the light switch.
I broke my legs skiing in Killington this weekend yet, I was still able to perform The Lazy Ninja!
The Lazy Ninja by The barn February 18, 2011
An emo ninja is generally a emo kid who goes around going 'omgosh ninjas are so cool they make me want to crap my pants!!!'
they talk about their 'awsome' ninja 'skills' and have pretend ninja fight with their emo friends
Jim: hahaha i will kick yo ASS with my awsome emo ninja skills
Kate: NOWAY cuz my emo ninja skills are so way more, like SKILLFULL than yours!!!
Emo Ninja by Viksta November 22, 2005

street ninja 

A peron in a gang,who has indeed lost so many brain cells that they think they belong to a Japanese night hitmen.
Yo nigga miky's so stupid. He think hes a street ninja, foo'! Oh can I be one, yea start by hittin' this!
street ninja by omar March 31, 2004

porn ninja 

to run into a room and jump on the room's occupants while naked or mostly naked while yelling "PORN NINJA!" and "I'M A KARATE DUDE!" at the top of your lungs. rubbing of your naked bits onto the person in the room is strongly advised.
doing ninja-like flying kicks is also appropriate.
made popular by Fall Out Boy's Pete Wentz in the video Release the Bats.
usually done when drunk, high, or just crazy.
"i was laying on my bed reading a book and Sally came in and porn ninjaed me!"

"Really? to what level?"

"she rubbed her naked body all over me and did flying kicks at my head!"
porn ninja by Lali Pop July 25, 2007