Nitty has a few different meanings, one being somebody who focuses on the small negative aspects of something instead of seeing the big picture. Basically nitty is used to describe a nitpicker. Also see nit.

Nitty is also often used to describe somebody who is tight with their money, or somebody who you can never please.

The term is popular in the poker community to describe somebody who is tight and plays only very strong hands, and now the poker community has expanded the use of the world to capture life nittiness too.
Example 1:

"Man I really love this game but I hate how my character only has 5 different pairs of sunglasses to choose from, what a load of crap!"

"Dude, stop being so nitty. Who the hell cares about sunglasses anyways?"

Example 2:

"I'm not sure what to get, the buffalo wings sound great but the hamburger meal is two dollars cheaper ..."

"It's a two dollar difference, stop being so nitty and get the wings, jesus."

"Never mind, I think I'll just get a salad."
by A5 May 17, 2008
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-from nit. To be nasty.
Coined in the famous pornographic video "Nuts In Buts" in which the main actor is accused by his co-stars of being "nitty", because he wedges his testicles inside the headline actress's anus.
by Ton' March 07, 2005
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Where a womens breast is covered completely by the nipple. A conversion of Nipple and Titty
When we were on top of the whore box at the club last night, Artemis flashed her big ass Nittys.
by Ron Coobie February 22, 2009
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- Nipple-Titties. Tits so small that they only show up when a girl starts nippin.

- What a girl has when she obviously has no tits.
That bitch aint got tits she's got nitties.

I thought that it was a dude but it's just a lesbian with nitties.
by Linke July 26, 2006
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Why's she even bothering buying a bra? She's just got nitties, anyway.

After getting a purple nurple, Bob growled at his friends, "Hey! No twisting the nitties!"
by Nerdlass August 15, 2010
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"Yo you know Ewan Smith?"
"Oh you mean the nitty?"
by The nitty August 23, 2017
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