The beer you take into the shower when you're in a hurry to go out and still need to get cleaned up, or want to relax from a long day.
Guy 1: Hey man, get going! We've got to leave in 20 minutes and you haven't even hit the shower yet!
Guy 2: I'm going, I'm going.. I haven't even started pre-gaming yet, what am I going to do?
Guy 1: No worries, I've got your solution. Take a shower beer.
Awesome Girlfriend: Hi honey, how was work?
Tired Boyfriend: It was stressful, my boss yelled at me and he wants me back in the office this weekend.
Awesome Girlfriend: Wow, what a day. Well don't worry, I'll start the shower and grab you a shower beer.
An alcoholic beverage one consumes while cleansing himself/herself.
Before getting dressed, while pregaming, Wally economically uses his time to shower and booze at the same time consuming his "shower beer".
The most delightful beer in the world. Can be anything from Pabst to Guiness, but must be consumed within the shower and while the shower is on.
I woke up with a mad hangover this morning, but after that shower beer I have a nice buzz on.