“You are in SO much trouble.”
Your 14-year-old son took your car and drove it around your neighborhood. He got caught by the police, and how you've gone to the police station to pick him up. You are so angry, and you're going to punish him later when you get home. You say this admonishing him.
You are in SO much trouble.
To be "in trouble" means that someone is angry at you and is going to punish you. So you can be "in trouble with" your parents, teachers, boss, customers, spouse, or other people who have the ability to punish you:
I'm in a bit of trouble with my wife for staying out late without calling last night.
Use "for ___" to explain why a person is in trouble.
You can also use the phrase "get in trouble" to talk about being in trouble as a single event in time. Use this when you're talking about trouble in the past or the future:
Once when I was a teenager, I got in trouble for drinking some of my dad's vodka and trying to fill it back up with water.
Aren't you going to get in trouble for that?
Parents say this to their children when the children do something really bad. This is pronounced with stress on the words "You" and "so":
You are in so much trouble.