also used and spoken as "Mind your Own Business" used when someone is interfering with your thoughts, actions, choices or point of view/s.
it's used to defend(yourself or someone else)
to mind your own business is to focus on your OWN body, mind, choices, point of views etc.... unless your a parent (then the purpose would be to mind yourself and child or children)
to be used with no explanation neccessary
(statement: I can not believe you said what you said to your boss the other day)
response "mind your own buisness"