Just leave me alone, I know what I am doing
A phase used to express extreme anguish and anger caused due to disturbed state of mind because of constant nabbing from a person in power. Commonly used to shut up a person who is continuously giving order to do something while you are doing it.
Example:
Mark: Kimi, so you have to break before the speed breaker
Kimi: Just leave me alone, I know what I am doing
Mark: Kimi, so you have to break before the speed breaker
Kimi: Just leave me alone, I know what I am doing