A response for when a person is really into whatever they’re talking about. They don’t need to be getting super excited about it, but in their head they need to calm down with whatever it is.
Cory: Dude have you seen the new episode of Entourage? Its so funny. The characters all get laid at once.
Niel: Calm Down, You’re going nuts
A door wall is a sliding-glass door or patio door. The term is yet another example of banal Michigan vernacular, where in the residents latch on to company names, trademark names, marketing terms and product names from local companies. The terms become embedded in the local vocabulary and eventually become accepted as actual valid words and phrases. In this case the term comes from Wallside Windows in Taylor, MI (a large window manufacturer), where 'door wall' is their created word for sliding-glass door.
"Bob! John's gonna bring over them doorwalls from Wallsides on Tuesdee afternoon 'round two-thirty. Get 'er done!"