A contraction for "am not" in an interrogative sentence, as for:

I am here, am I not? A contraction is not needed for the declarative use: "I'm not doing anything" has just as many syllables as "I ain't doing anything."

But "am I not?" has one more syllable than "ain't I?".
by p1z0 January 5, 2010
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I'ze not gonna do sometin
person 1: Do it for the vine!!!

person 2: I AIN'T gonna do it!!!!1
by THE_UNKNOWNERS69 May 3, 2015
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ain't is the definition of things that "ain't cool" "ain't chill" "ain't fun" etc,

anything or anyone considered unpopular is often described simply as "ain't"

instead of longer sentences,

making people sound incredibly white trash and/or stupid

also often heard as "ain't shit"
Hey man, you see george whereing those sandals?

Yeah man, he ain't.

yeah i know, he ain't shit!
by you.aint.shit November 4, 2011
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A phrase used to express to the other person that his/her struggles are not as serious as the speakers', that they would never understand the gravity of your hardship.
From Trippie Redd's "This Ain't That":

"Nigga's be talkin' shit but they ain't with that shit for real
Fuck nigga talkin' shit then he gon' get his ass killed
Fuck nigga talkin' shit then he gon' get his ass spilled
You ain't really real, you ain't with that shit for real
Nigga this ain't that for real, this ain't that for real
You's a bitch, you's a lame nigga, this ain't that for real
You's a bitch, you should quit, nigga, this ain't that for real
This ain't that for real, this ain't that for real
No legit, you's a bitch, nigga, this ain't that for real
Odell with the pick, nigga, this ain't that for real
I'm a fucking walking lick, but nigga this ain't that for real"
by primalmeme August 14, 2020
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The response said when someone says something that just isn't morally right, or disturbing.
Brad: "I just nutted on my cousins face!"
Tyquan: "Yeah, no that ain't it."
by I HERPED WHILE I DERPED! July 10, 2018
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That ain't it is just a more edgy or trendy way of saying No or disagreeing to something.
"That ain't it", Simon says as Caleb talked about eating cake with lasagne
by RoyaltySyd January 28, 2019
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A relatively new interrogative phrase, independent of the preceding verb tenses, used to emphasize the extreme nature of the preceding clause.

The phrase has its origins in the Atlanta Public School System. In its most common incarnation, it's said with a humorous, yet sassy look over one's glasses, or general "girlfrand!" attitude.
FUCK HIM!

(You mad, ain't it?!?!)

or

(You ain't mad, is it!?!)
by Nicholas de Lenfent April 7, 2009
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