When you send someone a naked picture of themselves that they don't know you took. Especially useful as a pick-up technique.
"Dude, Anna just sent me a ninja sext!!"
"What do you mean?"
"She just sent me a picture of MY penis, but I've never been naked in front of her? WTF??"
"True ninja broseph. She's a ninja sext master."
"What do you mean?"
"She just sent me a picture of MY penis, but I've never been naked in front of her? WTF??"
"True ninja broseph. She's a ninja sext master."
by Ninjasextmaster69 August 7, 2011

Ninja Rowson is one of the best maths teachers to have. He will perform a dance called the Ninja dance where he moves around as If he was a ninja whilst impersonating a Chinese/Japanese accent. He is a good teacher although sometimes he gets in a strop and sits back down in his chair for around 10 minutes of the 60 minute lesson you have with him .
"It's not fair you have an alright maths teacher" - Tyler
" what are you on about you've got Ninja Rowson"
" what are you on about you've got Ninja Rowson"
by XD :) July 29, 2019

While a girl is giving you head..right as you cum karate chop her in the back of the head then stick your dick in her nose
Guy 1: Dude this girl was giving me head then i totally did the ninja nosejob on her
Guy 2: Thats fucking gross man...thats messed up
Guy 2: Thats fucking gross man...thats messed up
by sandman142 August 17, 2010

by xxBA115xFreaKyx June 18, 2010

1.Of or relating to a ninja being highly skilled in combat, stealth, and covert actions. Most often known for being stealthy and deadly assassins.
2. The ability to perform duties efficiently and without hesitation to the highest level of perfection without detection
3.An action against a person without the victim knowing what hit them
2. The ability to perform duties efficiently and without hesitation to the highest level of perfection without detection
3.An action against a person without the victim knowing what hit them
by Madnass July 10, 2012

In Oregon Trail II, this term is used when someone in your wagon party dies inexplicably from cholera.
by A Dysentery Germ September 24, 2016
