Mind one's own business (Short video)

The phrase of the day is: "Mind one's own business (myob)"

• Used for telling someone rudely that you are not going to tell them about something because it does not affect or involve them.
  [ --- Who were you with last night? / Mind your own business. --- ]
  
• To be doing the things you normally do, without affecting what other people are doing.
  [ --- I was just walking down the road, minding my own business, when I was attacked by a mugger. --- ]