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(n)A very self-critical, nerdy yet fashionable, smart-but-won't-admit-it-because-they-get-too-embarrased, artsic-in-all-aspects, freak that is overly nice and says "sorry" over the littlest things (unless her temper flares--then beware), and COULD have the chance to become a popular prep but refuses to because he/she hates to be associated with stupid teens and thus chooses friends who are somewhat odd or geeky (or normal in rare circumstances) because unlike preps, they are very nice and honest, just like themselves.
These specimen also tend to be very mature thanks to having a wide age gap between the rest of her siblings--thus making friends better with their teachers than their peers (where conversations tend to feel awkward--unless with another Ninnish).
They also tend to be over-acheivers (or so others say) that always do the hardest thing they can, and if they don't follow their own plans they tend to become very frustrated and "head-hits-wall" with themselves.
Most of the demographic are female.
"Yaoi" tends to be one of their favorite things, though they will refuse to admit it even if the evidence is threatening to crush them into liquid carbon, nitrogren, hydrogen, and oxygen.
They also tend to be very over-obsessive fangirls.
Sometimes a bit *slow* and naive.
Finally, they prefer to be on the one "on top" and very dominating (both academically and... suggestively.)

(adj)Characteristic of the above.

-Also used as a nickname along with: Jessish, Quinnish, or any other name plus "-ish"
1)Friend: "Hey Ninnish! I love the exploding penguin mugs you gave me!"
Ninnish: "They're not exploding! That's just the tissue paper!"

2)Friend:"Don't be so ninnish! It's bad for your health!!!"
Ninnish: *pouts* "I-I know, I know! ...But I have to do this really complex and over-achieving assignment first."
Friend: *gives look*
Ninnish: "IT'S NOT MY FAULT! ...I can't help it."

3)Friend: "OMG, NINNISH! You got into Harvard?!?!"
Ninnish: "Yeah... Omg, YEAH! I did! Holy crap, I can't believe it! My biggest dreams have come true! It's a miracle!"
Friend: "No it's not, you're just brilliant!"
Nicolette: "NO I'M NOT. SHUT UP!" *stomps away blushing*
Ninnish by TheNinnish January 10, 2009
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ninishki 

Small patch of gay hair under your lip

Inventor- David Hobbs
Hey there chum nice ninishki ya sc
ninishki by Scdh January 21, 2017
Related Words
15 minutes before or after 9:00. AM or PM
"I'm running a little late, I'll be there around ninish."
ninish by D-Bruch March 3, 2012
(adj.)Anything that resembles appearance or behavior of a ninja.
"That motherfucker with the sword was so ninjish."

"That guy over there in the shadows looks so ninjish."
ninjish by T. Donges May 22, 2006

ninaishka 

A wonderful person full of emotions. A type of person with two personalities. Cute or naughty. Has a lot of friends and tends to fall in love quickly. It's honest and also fierce. Ninaishka it's also the definition of a spicy Latina.
I could just be Ninaishka for days!
ninaishka by YaLerias 101 February 23, 2017

ninniehammer 

when a wild ciosa ann kelly hammers her ninnie into ur face
human bean 1:i just got ninniehammered by ciosa k

human bean 2: omg your such a ninniehammer
ninniehammer by losh jee February 9, 2023