Jacob's Stressed Out

Jacob wanted to watch a movie tonight. I told him he needed to wait until my show is over. He began crying (very fake) and pouting. I told him if he couldn't be nice, he wouldn't be able to watch the movie at all tonight. He responded, "I'm angry because I'm stressed out. I'm sorry but I'm stressed out. Mom, what does stressed out mean?" Can you tell it's the middle of a very busy school semester?