Top Definition
Term used to describe a severe hangover!

In effect the hangover victims brain feels "Mushroomy" and unable to handle the day ahead.
In the course of this "Mushroomy" episode hangover victim is unable to hold a conversation. Cures include another drink and abstinence!
John's head is feeling mushroomy following a night out involving a copious amounts of booze.
by level 5 August 25, 2009
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