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

A derogatory term used in reference to people of Asian descent.

It is said to have been coined during the Korean war by frontline troops whom had run over enemy troops in jeeps.

The soldiers claimed that the tire tracks from the jeeps left a pattern resembling that of a closed zipper along the corpse.

Clint Eastwood's favorite racial slur in Gran Torino.

A racial slur referring to people of East Asian descent, coined by US soldiers during the Korean War. There are multiple proposed origins, but the most commonly accepted is that it if enemy Asian soldiers were shot in the head with high-powered weapons, their heads would split as if they had been "unzipped". Another origin could be that when enemy soldiers were ran over by military Jeeps, there would be tire tracks on them that resembled zippers. It's violent origin makes it a particularly derogatory pejorative.

It is often shortened to zip, though zip as a racial pejorative may have separate origins of its own

A racial slur coined by US soldiers during Korean War because if Asians were shot in the head with high-powered weapons, their heads would split as if you unzipped them.

Coined during the korean war and became widely popular during the vietnam war. Referring to the way the head of an asian enemy tended to split open when shot in the middle of the forehead. This splitting is due to the frontal skull suture found in mongoloid bone structure. massive directed trauma to the forehead will often cause the skull to split along the suture line causing the head to appear as if opened by a zipper.

This term was started during the Vietnam conflict to describe a Vietcong tactic.
After killing a GI in combat, the Vietcong split a soldier's head with a machete, then insert a live hand grenade with the pin removed. Replacing the helmet hides the booby trap.
When medics come to recover the dead, moving the body will cause the helmet to fall off and release the grenade, killing or maiming anyone in the immediate area.
Zipperhead describes the mutilation that the Vietcong inflicted on fallen soldiers.

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