A person over the age of 30 that likes 80s Rock and Monster Energy Zero Ultra, that wants things to go back to the way they were.

a slang term for hullucinagenic mushrooms containing psilocybin

In Texas Hold'em, a player in first position who overplays his/her hand going all-in.

Everyone folds and the boomer takes the blinds only.

A slang term for hallucinogenic mushrooms.

While observing a fat person puking it is customary to yell BOOMER to warn others so as not to attract the horde! Also works well as an insult.

psylicybin mushrooms. A term frequently used on jam-band lots or other headie areas.

A nickname for Mushrooms.
Mushrooms that a can be consumed in order to alter the mind state in such a way that you may begin to hallucinate and see colors as well as many other objects that may or may not be actually there in reality.