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

On the ninja seat 

When you're in the bathroom and trying to take a quiet crap if someone is outside the door. Or when ther is multiple people in the room at once

Tim was on the ninja seat when Judy was waiting outside the door for him.

On the ninja seat by Lizzie Smith II November 17, 2010

To get on the shovel like a ninja 

The act of sniffing white powder,flour,bicarbonate,soap and baking powder.
It's often performed by coke-addicts and idiots.
It also applies to ketamine consumers like Fernando Manzo.

''He's so screwed that likes to get on the shovel like a ninja''

To get on the shovel like a ninja by Fernandito manzo November 28, 2011

Ninjas on the lawn 

Along with paranoia, ninjas-on-the-lawn is the most common side effect of cocaine.

asshole: "What is that outside?"

you: "I'm not sure, but i think it could be NINJAS."

asshole: "There are no ninjas on the lawn."

you: "OF COURSE THAT'S WHAT THEY WANT YOU TO THINK; THEY'RE NINJAS."

Ninjas on the lawn by SnowhuouV October 24, 2012

ninjas on the street 

Dope ninja looking dudes who participate in anime and parkour.

Aye Richard look at those ninjas on the street.
Sick Gerald let's ask the if we can join their club

ninjas on the street by Youaintgonevanomyname May 25, 2017

ninjas on the roof

impending doom

as soon as i walked in on Stacy and Jill and that 6 foot toedo, i knew there were ninjas on the roof! Phil would be pissed.

ninjas on the roof by freewilly23 January 18, 2009

there's ninjas on the lawn 

Its a less racial way of saying there are black people somewhere on your property. We say it when blacks show up at our haunted house. The blacks are usualy the ones that hit our monsters and get all kung foo on that ass when they get scared. So when they show up, a call goes out over the radio that "there's ninjas on the lawn"
I have also used it when there are black ppl around my store. Like when they hang out in the parking lot doing nothing.

I saw a group of black people headed for the entrance to our haunted house, so I alerted the managers that there's ninjas on the lawn.

there's ninjas on the lawn by Russ Bus January 9, 2008