The Alabama Slammer has a short history, though both this highball and the shooter of the same name were hits at the bar from the 1970's through the 80's. They were popular among the college crowds of the time, particularly at the University of Alabama where it is said to have originated.
Which came first, the shot or the tall drink? It's likely that the shot was first and that is simply based on the correlation between the Alabama Slammer and the University of Alabama Crimson Tide football team.
The ingredients are the same in both Alabama Slammers, though in this mixed drink there is substantially more orange juice. The Southern Comfort adds an apricot-peachy flavor that mixes well with the amaretto and sloe gin.
Admittedly, the Alabama Slammer is not as popular today as it was a few decades ago. It was created during a time when bartenders were mixing up some very strong, very sweet drinks and even the SoCo and sloe gin used here are not seeing as much use as they once were. It is a good throwback drink.