Have no business doing something
Definition 1 of 1
Pro Tip 1/3Inappropriate Action
Use it to express that someone's doing something they shouldn't morally or socially. 
You have no business spreading rumors about others.
Pro Tip 2/3Not Your Role
Emphasizes that someone is stepping outside their usual role or authority. 
You have no business giving me advice on my marriage.
Pro Tip 3/3Strong Disapproval
Shows a strong disapproval of someone's actions or involvement. 
You have no business commentating on how I spend my earnings.