nah , imma do my own ting
A lazy person who says they're doing their own thing but it's just because they don't want to do what you said and they don't want to look bad.
Nah, I'mma do my own ting. I don't wanna go to the party with you. I'm just gonna text my ex instead.
Nah, I'mma do my own ting. I'm just gonna eat pizza and watch YouTube. Why would I do what you said?
Nah, I'mma do my own ting. I'm not gonna help you with your math homework. I'm gonna play Fortnite and pretend I'm rich.