The word flabbered orginated as AAVE on black twitter in 2017, it means surprised or shook. Though not commonly used anymore its arose on tiktok as a second rebirth.
The act of giving a fellatio laying on a bed/ couch while on your back. Your head is off the side and the male stands over you while his penis is fully inserted down your throat, touching your gag reflex while his testicles are draped and covering your nose and eyes.
Dude, you should have been there last night, I flabbergaggled her till she almost passed out.
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!"