beer fog 

The beer's spirit (or birit) escaping its frosty cask.

As I opened my frosty bottle of PBR I notice the birit escaping into a beer fog.

beer fog by Foxie22 December 24, 2014

foggy beer 

The act of taking a rip and blowing your smoke in a half drank beer bottle, and then chugging it.

yo we just trying to get high from a foggy beer, maybe a little buzz or something you know

foggy beer by maryjane5000 March 14, 2013