In the stereotypical Western a moody stranger comes into the saloon and says “Gimme a shot of Red Eye”. The barman, who wears a white apron, slides a glass along the bar, followed by the bottle.
Here are some other Old Western slang names (allegedly at any rate) for whisky.
Tarantula juice
Strychnine
Mountain howitzer
Coffin varnish
Chain lightening
Tanglefoot