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Some one who entertains you when your bored
"So what did you do last night?" "Talked to Taylor" "You talk to her a lot!" "Yeah she's my Ninjina"
Ninjina by GreatBowlofSexy September 5, 2011
a supreme specimin of female genitalia, connoting
John: "So last night, Jane and I, y'know... for the first time. But DAMN! she had one HELL of a ninjina brah. My vision blurred and I saw stars."

Jack: "No... seriously?"

John: "Ser'sly brah. She had a ninjina dude... a nin-fucking-jina. Totally."

Jack: "Woah."
ninjina by J Vivs June 27, 2005
The Ninjina (Ninja + Vagina) is the mascot for the "Pussy Air Freshener," a cherry scented adult novelty product that you can display in your car, garage, or dorm room.
Phil: "Dude, it's pretty rank in here."
Jack: "Yeah, I wish the Ninjina would pay us a visit."
Phil: "The Ninjina?"
Jack: "Yeah, the Ninjina. He suddenly appears in a puff of smoke, and throws Pussy Air Fresheners like Chinese stars."
Phil: "He what?"
Jack: "You heard me."
Ninjina by SuicideGear February 15, 2010
The Coolest Carrot the world is ever seen

penis
The Coolest Carrot the world is ever seen

Kid "OMG NINJIN U A CARROT"
Ninjin "ye"

Kid 2 "I feel like eating a Ninjin"
Ninjin "OMG PLZ NO EAT ME"
Ninjin by JayIsKool69 October 4, 2016
Displaying the abilities or likeness of the ninja.
Last night, no one knew we were present, which was in large part due to the fact that we were ninjing in the shadows.
Ninjing by Nine Lives Co July 18, 2018

ninjiate 

v. To be or act like a ninja; to perform any ninja related actions (steal, sneak, kill, fight, attack); to perform with stealth or skill; to use any form of martial arts.
They must ninjiate into house, or there will surely be consequences.

How do you intend to ninjiate the Senator?
ninjiate by M. C. Ericson September 23, 2008