bonus beer 

Beer which one "discovers" having not known that it was there. Typically this occurs after a party or family gathering/event and may often involve a secondary fridge or forgotten cooler. Discovery of said beer is usually followed by feelings of joy and well being, similar to finding unexpected money in a jacket one has not worn in some time.

I'll just clean out the fridge, haven't done that in a while... wait a sec what's this? BONUS BEER! Righteous!

bonus beer by Chef Dionysus September 12, 2008

Bonus Beer 

When you're too drunk too remember exactly how many beers you have left, but you have 1 more than you thought.

Pretty sure the're only 2 beers left. *Opens fridge* Oh shit, bonus beer!

Bonus Beer by UmamiDaddy March 11, 2020

Bonus Beer 

A lost beer you find in the fridge.

I woke up in the morning thinking I drank every ounce of alcohol the night before then SHAZAM!
Bonus beer magically appears!!!

Bonus Beer by knockanutt November 5, 2017

bonus beer 

the worst word ever, shitty beer, UF late night beer after the bars close (i guess)

"guys want a bonus beer?"
"no gimme a miller light bottle"

bonus beer by boston March 9, 2005