Ninjevity 

The amazing ability to make people believe what you want them to believe. To take someone's plan and crush it before their very eyes without them even knowing that you did it.

"Neut has amazing ninjevity"

"Ninjevity: did you see what I did there?"

Ninjevity by BrendaBadabing June 5, 2014

Ninjavitis 

A condition marked by frequently startling people on accident, such as while walking up behind or beside them to say, "Hello." Most accurately described as pervasive accidental sidling.

Ninjavitis most commonly occurs among those who wear wrestling shoes, women with small feet, and the Japanese.

Person 1: (Casually walks up beside Person 2) Hey, man!
Person 2: Dude, you scared the crap outta me! It's like you've got ninjavitis.

See also: sidler, sidle

Ninjavitis by The Cruz October 19, 2010

Ninjavitus 

A rare disease that gives you the skills of a level 8 ninja master.

Ninjavitus symptoms may include friends and family dying from sudden and uncontrollable karate chops, and the urge to carry ninja stars.

Ninjavitus by Evan Salas March 27, 2007

Ninjavited

Short for "Ninja Invited" (see Also "Ninja Invite")

A term in on-line gaming, especially World of Warcraft. It's the process of inviting someone to join your group (party, raid or guild) without politely asking them first.

"Sorry, Honey, as soon as I logged on I got Ninjavited to the raid"

"We need someone to dps, just ninja-vite someone from LFG"

Ninjavited by Laliho August 7, 2009

ninjility 

Having the agility of a Ninja

He displayed his ninjility by dodging the cars on the freeway

ninjility by margaret-vandersnoodle March 27, 2009

ninjosity 

Descriptive term for explaining someone who is currently experiencing a high level of ninja like being. For example, getting continuously whooped at a fighting game would give you a very low ninjosity.

a: Dude, did you see that guy take out those 4 guards in two seconds?
b: No way!
a: Yes, the ninjosity is high in that one.

ninjosity by David of the Ninja clan Higgins August 26, 2007

Ninjocity 

n., the overall sum of one's skills, experience, and proficiency in the ninja arts, including but not limited to, style, weapons mastery, and ancient ninja majicks.

His ninjocity is unrivaled in all the world.

Ninjocity by William Wulph March 11, 2009