colloquially used to describe a person with a penchant for lying flat on their back and offering their face as a female's chair or resting place in anticipation of the double-glazing that will hopefully follow, generally for the entertainment of others and occasionally in exchange for money.
A person or group of people that travel from one unclaimed seat to another (normally at sporting events) because their cheap asses couldn't fork up the money for better seats. Said people are forced to move once seats are claimed by the rightful ticket holders.
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!"