I ain't on that shit! - You're telling someone you're not going to be dragged into t

You're telling someone you're not going to be dragged into their mess or their problems.

I ain't on that shit! I ain't going to get dragged into your mess.

I ain't on that shit! You're in trouble and I ain't going to be your backup.

I ain't on that shit! I ain't going to be your sidekick in your chaos.