Your forehead got a restraining order from your hairline.
Restraining Order
Categories
Explanation
Experiment
Explain Bear
Listen up, genius! This joke is saying your forehead is so freakin' huge that your hairline had to take legal action to get away from it! It's an insult, see? Like, you got a fivehead, not a forehead! I bet you went to school for 10 years.