In a saucepan over medium heat, melt the butter.
Add the flour and cook, stirring constantly, for 2 minutes.
Take a sip of beer (shhhhh), and then slowly whisk in the milk and beer, increase the heat to medium-high and bring the mixture to a simmer.
Continue drinking said beer.
Add the mustard, Worcestershire and hot sauce and cook, whisking occasionally, until the mixture begins to thicken, 3 to 5 minutes.
If you are brave, add in more mustard to taste.
Working in batches, add the cheese in large handfuls, whisking until sauce reaches an ooey-gooey consistency. Season with salt and pepper.
Serve immediately with soft pretzels, bread or any other vessel to transport this cheesy goodness directly to your mouth.
Drink more beer. (this part is optional, but encouraged)