When you take a fast, odorless, silent shit that has almost no residue when wiping.
I had to take a shit at school and it was a Ninja Shit, thank god.
by Osi777gt March 23, 2021
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When you have finished going Number Two, and suddenly feel more on the way.
"Man, got half way out when I got struck by Ninja Shits"
by Ormagoden September 2, 2014
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When a man and a woman love each other very much they often engage in sexual acts. This is known as a Ninja shit pucn

Preperation:
The man needs to have a shit that is about the same size as his erect penis. Remove the said shit from the toilet and put it in the freezer for later.

Once your woman is home remove said shit from freezer and place under pilow (or easy access to wherever the act is going to take place).

The Act:
Once you and your partner are engaged in sexual contact you begin to have anal sex. The man teases the woman by coming all the way out and back in again. After about the 4th time, stealthily grab the shit and shove it in her anus.

Whilst she still thinks your inside her stealthily run up and turn on the light. Run toward her shout "Ninja" and punch her in the face.

The End
Ninja Shit Punch, enough said
by KingLouie2 August 28, 2008
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Crazy ass or stupid knives or weapons that are just ridiculous

A category on Tumblr
Dude that double sided batman knife is some Mall ninja shit
by B,B,B,BIRD,BIRD,BIRD,THEBIRDIS November 20, 2017
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Someone who sits in a public toilet taking a shit as silently as possible, not moving around or making any noise, with the intent of catching someone doing something embarrassing thinking they are not there.

It is usually a good idea to duck down and check for shit ninjas before you do something that would otherwise be considered embarrassing.
Joe: *walks into bathroom, thinking nobody is in there*
Joe: FUCK, that slutty little bitch was SO motherfucking hot! But too bad she's only twelve years old! *slams wall with fist*
*sound of rustling toilet paper*
Joe thinks: (Oh god, it's a shit ninja)

Mike: *walks into bathroom, thinking nobody is in there*
Mike: I gotta take a massive fucking dump! *FAAAAAART*
*sound of someone shifting around on a toilet seat cover*
Mike thinks: (fuck, not another shit ninja)
by Duo47 March 2, 2009
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The art of taking a shit or farting without your boyfriend, husband or roomates knowing you did so. Only females can be shit ninjas
"Dude my wife is a shit ninja, we've been married 2 years and to my knowlege she hasnt shit once."

by anthony calloway February 17, 2008
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The evil bandits that shit in one's mouth over the course of a night, leading to the not-so-fresh feeling we all know as morning breath. The ninjas camp out longer after one participates in a night of drinking or other elicit activity.
Man, the shit ninjas really got me last night.
by the ham wallets February 12, 2012
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