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As in to become nice or of a more likable attitude.
Greg better nicen up if he wants that promotion. He's kinda a dick.
Nicen by ONI14122494BB March 24, 2021
verb version of nice. to make something nicer

no this is not a real word, but it should be ;)
i'm nicening up this room with a vase of flowers
nicen by Legnog January 1, 2023
The word is used when something is not nice but say “not nice” is to long
Nicen’t by SandBlockz July 22, 2021
Nicen't is a term used to define something that is "not nice" or rude.
"That was nicen't of you"
"She is very nicen't"
"Eating my soul would be nicen't of you."
nicen't by QuestionableCompliments November 21, 2021

Niceberg 

Nobody is sure what the word may be, but the gay's claimed it when a young TJ Kippen used it to compliment his crush, Cyrus Goodman.

The word can also be used as a nickname or another way to compliment a 'friend' when they're winning a game of ping pong against their former crush.

Niceberg is mostly used buy disaster gays when they're unsure of what to say in situations when they're in close proximity of their crushes., use it on your crush today!
TJ slowly approached the two boys playing ping pong, watching as Cyrus was beating Jonah in a game of ping pong.

He stood next to Cyrus, he was so close that their shoulders brushed.

TJ tried to come up with a compliment

TJ: *in his mind* say something smart, say something smart.
TJ: *out loud* Niceberg!
Niceberg by wybornlovat January 21, 2019

Nice girl slut 

An otherwise completely normal and sweet girl who is a bit of a slut when it comes to her sexlife.
Person 1: Wow, do you know that girl Jennifer? I've heard she's dirty in the bedroom!
Person 2: Really?! But doesn't she get really good grades and volunteers at the animal shelter?
Person 1: Yeah, dude. She's a total nice girl slut.

"I want to marry a nice girl slut one day!"
Nice girl slut by CosmicBanana April 26, 2014