This drink was named during the trend of naming drinks using mixology terminology to indicate the ingredients used in the drinks composition. This drink is a derivative of the Slow Screw and is indirectly derived from the screwdriver. This drink appears in literature as early as:
Wordly wise by James McDonald in 1984
"implications although the names are really elaborate puns: A long slow comfortable screw, for example, is served in a long glass, contains sloe gin, 'Southern Comfort' and the elements of a 'Screwdriver', vodka and orange juice"
This drink started the trend of naming drinks that were entire sentences, such as a "Slow comfortable screw up against the wall, Hard, with satin pillows and a kiss" Which of course would be, Sloe gin, Southern comfort, Frangelico, Whiskey, Amaretto, Galliano, and orange juice.
This drink also appears in:
The bulletin: Issues 5617-5625 in 1988
" But the cocktails with the cachet at the moment are the Freddy Fudpucker (tequila and galliano) or — for the confident girl — the Slow Comfortable Screw (vodka, gin, Southern Comfort)."
The Bartender's Bible: 1001 Mixed Drinks and Everything You Need ... - Page 195 by Gary Regan in 1993
"SLOW COMFORTABLE SCREW 11⁄2 ounces vodka 4 ounces orange juice V2 ounce sloe gin."
This drink dates between 1980 - 1982 and contained at least as of then:
Shake these ingredients:
Strain into a highball glass filled with ice cubes.