I don't know if anyone has ever had one. Even Fat Ted wouldn't spoil his mug of whiskey with a beer.
It was on a list some of my friends and I came up with about how to get messed up in a hurry. Others on the list were the Coke&Rum (just enough Coke to give the rum some color) and drilling a hole in the bottom a liquor bottle to shotgun it.
Thankfully, I was never a hard liquor devotee, with the exception of an occasional shot of Jagermeister, or an occasional Margarita.
Of course, German beers of the dunkel, doppeldunkel, und bock varieties packed quite a wallop unto themselves.
Nowadays, I get a look of surprise when I'm enjoying a tall Guinness (draft only), especially when I tell them it has the same alcohol content as a Coors Light.
I've never had a hangover from Guinness, nor have I gotten very tipsy after drinking a few, which is an extremely rare event nowadays. If I do feel any tipsyness, the keys are handed over to my wife.
They were common in the bars around the large factories in Michigan when I was a lad. Entire shirts of men would come off their shift and walk to the large bar across the way. To deal with this huge rush hour the bars would pour, in advance, many mugs of beer (Stroh's in Detroit) and shots of bar whiskey. These would be lined up on the bar and men would simply pick them up on their way in and take a seat.
The idea of dropping a shot glass in the mug of beer and tipping the whole thing down the hatch sprung from this tradition.
After you have two you will be saying "MakerBoiler" too.
You can order them in bars of that type to this day: you will get a mug of beer and shot of cheap whiskey. Whether you drop the shot glass in the mug after drinking the top is up to you.
Some bars in Oregon will not serve two drinks (a shot and a beer) to anyone.