One's refusal to participate in an act, conversation, etc. South Side Chicago lingo.
Got some smoke, want some?
Naw, dude, I ain't on nat.
by staccato brainstem February 17, 2005
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a common phrase you use to express the fact that you aren't a bitch, pussy, wuss, etc... Commonly used when you want to want to do something you normally wouldn't do on a limb.
guy 1: there's no way in hell im going outside
guy 2: fuck it i ain't no bitch
*goes outside and suffers in the cold, but fuck it at least he ain't a bitch*
by DickTwingler69 December 3, 2018
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A response to being accused of trippin. Similar in meaning to "No shit!" "I swear to god!" "I'm not kidding!"
"Son, you are straight trippin if you think you're gonna hit that shit."

"I ain't trippin! Watch me work my magic, fool!"
by Danny Delinquent December 23, 2003
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Basically, you do not care about whatever someone is talking about, or what they are refering too.
Alex: Someone made a rumor about you.
Amber: I ain't on that shit!

Whitney: But I wanna go to the mall!
Crystal: I ain't on that shit!
by Amber Walker September 7, 2006
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A word that literally make russian people got mad with blyat
Gun owner: I hope you like our AK's
That one dude who ain't a russian; I ain't russian
by Undercover1122 April 29, 2021
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I actually am racist and I'm going to tell you something I read online which supports and confirms my opinion.
I ain't racist but I just saw a website that tells the real truth about that rotten commie, Martin Luther King.
by Crawdad Nelson December 2, 2016
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