What is expressionism?

To me, expressionism is like that draw you feel to watching a car crash or a dog shit. Clearly you're supposed to look away but for some strange reason you keep watching. Expressionism is putting all the emotions that society likes to ignore and put under the rug and letting them explode all into one piece of work. I consider expressionism "naked art". As you take layers of clothes off, things change. Once you're naked, you're naked. There's nothing else to take off. Expressionism is emotion at its purest form. Expressionism is those thoughts in your head that no one else can see like when your in class and you zone out and picture what would happen if you just got up and flipped over a desk, or smacked someone that's been pissing you off in the face. Expressionism is those secret thoughts, but actually doing them.