snorting the foam from your beer. typically from the foam formed after a fresh pour at the top of the solo cup of natty light. this is done to give you a little alcohol buzz and fulfill the physical desire of snorting drugs without actually snorting illegal drugs. foam domes are also useful to reduce the foam at the top of your cup instead of waiting for it to dissipate on its own. doing a foam dome is the act of plugging one nostril, dipping your nose into the foam, and snorting it, the same way one would snort powder drugs.
man that foam dome fucked me up i'm on a different level