The full form of NT is nice try.
This acronym is used to represent the phrase “nice try.” It is used to congratulate someone on their efforts when they have given it their all but didn’t quite succeed. It can also be used as a form of sarcasm to say someone’s effort was lacking or that what they did was not a very good thing to do.

Origin of NT

There is no specific origin information available regarding the origin of this acronym or the phrase that it most popularly represents. However, the phrase “nice try” is a popular phrase that is a part of everyday speech and one can deduce that it reduced this acronym, like so many other common phrases, to make it easier, quicker and more convenient to type during text and online conversations.

Other Meanings
There are many other phrases that this acronym can represent. There are just too many to mention them all here. Some of the other phrases this acronym can represent are “not telling,” “no time,” “nice toss,” “no thanks,” and “not today.” The term can also be used as a standalone word to mean “negative” or “someone stupid or who does stupid things.”

Conversation Examples
A text message exchange between two friends.

Friend 1: (sends a link) Hey, click this link to see something spectacular.
Friend 2: NT, but I know that link and I am not falling for that again!
Friend 1: Darn! I was hoping it would scare the crap out of you!
Friend 2: It did the first time. That is why I remember the link!