"Right this minute" means "now" or "immediately". If you are angry at someone and you have authority over them, you can tell them to do something "right this minute":
Come here, right this minute!
Only tell someone to do something "right this minute" if you're in charge of that person. Here are some examples of situations in which you can do that:
- a parent who's angry at their child
- a commander in the military who's going to punish one of the soldiers under their command
- a wife whose husband has done something wrong