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"
(Q) why did you get that color shirt the orange one looks better
(Response: Mind your Business) with no explanation necessary