Back in the old west, most whiskeys were 100 proof. However, there was generally a bottle of 86 proof that was reserved for the ladies. When a cowboy couldn't hold his liquor, or would get to rowdy, the bartender would pour him a shot of the 86 proof whiskey. The cowboy was supposed to be so embarrassed by this that he would leave the bar.
Orgin: 1940's? bartender slang.
bartenders use to switch 100% proof to 86% proofs after a person got drunk. cuz the loaded person couldn't tell the differnce. and when person falls asleep at the bar they would get booted out. this would help them get more customers and save up for the more stonger and costly proofs everybody wants.
now it is used to mean to get rid of something or a person (not at bars).
you got to 86 that gold tooth man.. that shit is tacky.
Popular in the bar and casino business.
Stems from the days when men drank 100 proof whiskey in bars while women were served 86 proof. If a man became too disruptive, the bartender made a big show about pouring the drunk a "women's drink." This usually embarassed the inebriated patron suffiently to send him for the exit -- hence today we "86" unruly customers.
2. "86 43!" = impeach the 43rd president of the USA (GW Bush)