One who extends the realms of their though, as though through unzipping their minds. Usually involves the use of LSD and other psychedelic drugs.

1. A person with a closed mind, or is narrow-minded.

2. The name of a kickass shop on South Street in Philadelphia, which gained fame from the music group The Dead Milkmen.

An individual who parts their hair down the middle

A layered shot.

Is usually made by filling a shot glass with ice. Add a straw before filling with liquor.
Layer one: Chambord (raspberry liquor)
Layer two: Vodka
Layer three: Club soda

But at the bar that I work at, we also make zipperheads with the following layers:
Layer one: Raz-a-taz (raspberry Schnapps)
Layer two: Raspberry Stoli
Layer three: Sprite

One high on methamphetamine and acting immature (goofy) as though they unzipped their head and removed their brain

(zippered)

A person who does somthing so stupid that it seems like they unzipped their head and pulled their brain out. A really dumbass move.

in the army during the late 60's and 70's
a soldier that was a stoner would part his hair down the middle, like it was when he had long hair before he got drafted.