Ninjabag 

To flip someone's backpack inside out, insert all the books/stuff back in it, zip it back up, and hide it somewhere. This is a great school prank to your friends.

John: Yo where's my bag?
Steve: Not sure, but Alex told me you got ninjabagged so good luck.

Ninjabag by Danny Banny December 7, 2011

ninja 

The art of dissapearing from a room or area with people, without any of them noticeing. it is very awesome, and hard to learn. they are great at partys, and it makes a terrific exit. *very similar to "pulling a batman".

GUY #1: so, dude, have u like, seen tony around here? I beat him in a chugging contest.
GUY #2: yeah, but he must have left.
GUY #1: no way, i had every exit covered. the dude owes me 5 bucks!
GUY #2: dude! do u know what happened?? the dude must've pulled a ninja on you!
GUY #1: what i jerk. but you've gotta admit, its pretty cool.

ninja by Quantum Kestrel December 29, 2011

Ninja Snap 

The act of pretending to text whilst secretly attempting to take a hilarious picture of another student or teacher, resulting in a long period of outrageous laughing between you and your colleagues.

Dude 1: Oh my god, dude, did you see this pic I got of Charlotte?

Dude 2: HAHA! You ninja snapped her to hell!

Ninja Snap by theurbanduckling January 12, 2012

Ninja Fart

To fart without hearing or feeling it. Often occurs when the person needs to use the bathroom to take a #2.

I was lying in bed under my covers and my ninja fart almost made me sick!

Ninja Fart by Vandalier January 24, 2012

Ninja Boss Mode 

Any sudden appearance of luck in the online gaming society that grants you multiple killstreaks or higher ranked session score.

I went Ninja Boss Mode in MW3 last night, ended up 3 kills to 42 deaths!

Ninja Boss Mode by NinjaBoss24_7 October 30, 2012

Ninja Discreet 

being extra careful about doing something. You are discreet, but to the umphteenth degree. Like Asians. And discreet Asians would be ninjas, right?

Cass: Man, boys are so lucky. They can scratch whatever they want, whenever they want. WHEVER they want.

Me: Us girls can, too. However, since we are ladies *holds up a pinky* we must be ninja discreet about it. Observe. *looks to the left, then to the right before scratching boob*

Ninja Discreet by MyNameIsChachi March 16, 2013

ninjaing 

Sneaking out of a party/bar without saying goodbye, unnoticed, like a ninja.

"Hey, where'd you go last night?"
"Aw man, I was starting to feel the shots so I had to ninja"

"Where'd your friend go?"
"Oh, probs home. She's bad about ninjaing"

ninjaing by kylzzville December 5, 2013