Ninja Nap 

the act of napping unexpectedly when the feeling of being tired is not present. should be avoided when operating heavy machinery or driving a motor vehicle. preferably takes place on a couch or another piece of furniture; not to be confused with fainting

"i was just sitting there talking to my friend and all of a sudden was hit by a ninja nap"; "sorry, just ninja napped"

Ninja Nap by cardancechamp24 March 8, 2010

Ninjaculation 

The act of ejaculating on another person without them being aware of said act.

I earned my black belt in ninjaculation last night when I popped one all over Cindy's face while she slept.

Ninjaculation by pseudomine September 8, 2011

Ninja Fuck 

When you ( a male) is having sex with two other people ( male or female) and you fuck them in the butts back to back. Hence, you see an ASS, you see an ASS, and you went IN, or assassin ( which is a word used to describe a ninja).

Joe Schmoe: Hey bro, I just had a consecutive buttsex with these two smoking hot chicks last night
Douchebag Dan: Duuuuuude! You just had a Ninja Fuck!!!
Joe: Totally gnarly dude!!

Ninja Fuck by Jdawg96 December 17, 2013

Assistant Ninja 

An assistant to other ninjas.

Pro_Skater is the assistant ninja of _Yuna_ and KJM.

Assistant Ninja by Pro_Skater February 28, 2003

Dancing Ninja 

how asians masturbate. since theyre penises are so small, and theyre bodies are so flexible, they use the space in between their toes to stimulate themselves, thus looking like a dancing ninja.

sonny: I bomb da harbor!

justin: bombing da harbor was such last year, now i do the dancing ninja.

Dancing Ninja by bombharbors April 17, 2011

ninjad 

Ninjad- the verb form of Ninja

1. v. The past tense form of taking an item from a person without their noticing, usually right in their line of vision.

2. Used in the popular game "Halo" for xbox 360 when a player is getting chased down by another from behind, jumps backwards, and assassinates the enemy. (past tense)

1)
Person 1: Where did my gum go?

Person 2: Bob totally ninjad it from you when you were playing basketball with him.

Person 1: Damn it, he is always taking my gum.....

2)
Player 1: How'd you kill that guy when he was chasing you and unloading bullets into your back??

Player 2: I totally ninjad him, he never saw it coming.

Player 1: ohhhhhhh, what a noob....

ninjad by Epic Lavalamp March 24, 2010

Ninja Tuna 

A person, so awesome they amaze every person who sees them... they also have horrible B.O. and breath that smells like Tuna, so you are reluctant to approach them but always enjoy there awesomness from afar.

"Carl is so awesome! but he's more of a ninja tuna, so I don't hang out with him."

Ninja Tuna by eliwa&kimmy March 24, 2010