What is a red eye coffee?

A red eye is coffee with whiskey added to it. A "red eye" is made by adding brewed coffee to an Irish whisky glass before topping with more Irish whisky, and here's how the term has come to define the drink over time. First recorded usage of 'red-eye' in print was 1937, citing a newly coined phrase thought of on the spot by Roger Janis of Oregon Oregonian newspaper during Prohibition. Janis was trying for alliteration--adding "beerjacks" just wouldn't do for this hard-drinking crowd he wrote about back then https://www.youtube.com/watch?v=4_f0BMX3TXI -in order to describe what seemed like something