Follow the rules and you won't get chewed out.
get chewed out直译过来就是：“被嚼碎了”，这个短语的正确意思是：“被训斥，挨批”。因此，当美国人说"Follow the rules and you won't get chewed out."时，他/她要表达的意思就是:"If you follow the rules, you won't be criticized."、"Follow the rules and nobody will find faults with you.".
Terry: My boss turned back to get his passport and found me playing computer games. So he roundly criticized me.
Benjamin: Follow the rules and you won't get chewed out.
①Yes,sir. I got it!
②I've learned a lession this time.
③I won't get late next time!
④I will be careful from now on.
1. find fault with sb. 挑某人的错
You have no reason to find fault with him.
Some persons are prone to find fault with others when they should be blaming themselves.
2. roundly adv. 直截了当地
They roundly denounced him for quitting.
I choose rather to hesitate my opinion than to assert it roundly.