Had a lot of horrible beer through the years but Tequiza and Carling Black Label stand out as the worst of the worst.
Anyone reading this thread should read this one we had awhile ago:
It lead us to discover:
See more here:
I recently tried a beer, sadly I can’t remember the full name, but it contained the word draco or similar and was around 9% ABV.
It was foul. I only tried it because it came in a nice glass with a picture of a dragon on it. It was almost acidic enough to put on chips (or fries for our translatlantic cousins).
All of it.
Oh god this. Colleges kids would always buy one case of something good and then 50 cases of this swill because it was cheap. The last time I was subjected to it I just carried the full can around pretending to drink from it so no one would suggest “Hey, let’s get another beer.”
It was only around for less than a year, I think. Here’s some guy drinking it and incredibly, not barfing.
Count me in as a Staropramen fan, and London Pride from Fullers is a fantastic london beer.
Worst beer - Tennants Super - just nasty nasty stuff, however it was cheap and strong which seamed important when we were younger.
Had a few samples of fruit beers , also rank.
The worst beer in the world, bar none, is Beer-brand beer. It comes in a white can and the label says, simply, “Beer”. Lies, I tell you. Horrible, horrible lies. Sucking on the aluminum can itself can’t possibly be worse than what’s in the can.
The worst IMO is “Milwaukee’s Best”, a mislabeling if I ever saw one. Very watery and barely has any taste. Grass clippings soaked in water would taste better.
But for some strange reason, my mom loves it. Conversely, I like Guinness and she doesn’t. So for the short time after I graduated college and lived with them, she bought MB and I bought Guinness, and we left each other’s stashes alone. 
Every beer I have ever tasted is what I imagine mule piss to taste like.
Disclaimer: I don’t drink. Obviously, I have not acquired a taste for mule piss.
Miller Chill.
I take it you’ve never been to Milwaukee.
Seconded!
The worst beer I ever drank was National Bohemian (aka “Natty Boh”). It’s odd in that it gets gradually worse the more you drink it. The first one I thought “I don’t really like it, but it’s drinkable”. The second one I thought “Actually, this is pretty bad”. Then I opened another just because I didn’t want to waste it, and I couldn’t finish it.
Brick brewery Red Baron. Not sure if they still make it or not. Tasted like someone dropped a cigarette in it. And yes, I know what that tastes like.
In the early 90s I killed off 2 forties of OE. I woke up the next day feeling like a chain smoking skunk had shat in my mouth. Egads, but it was vile stuff. You may ask why I drank 80 oz of the stuff, and you would have a valid point.
Another misadventure this thread has forces me to relive is the night I imbibed In King Cobra Malt Liquor. I my defense, that night we were trying to find the most nasty beer possible. I think I accomplished the mission.
Yuengling is my beer of choice, but I have found that it does not travel well. The further away from the brewery you get, the less I like it. (The green bottles maybe?)
I’m not a beer drinker, but I co-host a D&D game every other week where the goal became “find the worst beer ever.” Some of those listed here made the cut…Miller Chill, Steel Reserve. Clamato was no one’s favorite. Also, Evil Eye and OE 40s - the apple flavor was particularly bad.
But the winner was Four Loco (or 4Loco) in, if I remember, fruit punch flavor - though we tried several of their flavors, all we could find. Take very bad watery hoppy beer. Disolve a handful of off brand jolly ranchers in said beer. Add caffeine, guanine and ginsing - its a “beernery” drink.
Guinness.
Yes, I know it is an acquired taste - I am just not able to acquire it.
To me, it tastes like some thick syrup made from tree bark, mixed with mud.
Heh 
The strawberry-flavored Hans isn’t bad! I’ll second the Carlsberg, though. How the hell does anyone drink that watery piss?
I don’t mind Red Baron. I’ve certainly had worse:
[ul][li]Gennessee Cream Ale in a can – tasted like aluminum can with a beer aftertaste[/li][*]some microbrew I didn’t catch the name of – tasted like luncheon meat. Beer should taste like beer, not baloney.[/ul]