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1.
Description that is given to men/women who are usually angry and depressed all the time that suddenly become happy and laugh with no particular reason what so ever or become happy and amused by small things.
Example 1
Guy 1: Whats wrong with your wife lately? She baked me cookies and i dont even like baked goods.
Guy 2: Shes taking shrooms.

Example 2
Double Rainbow Guy: Wow thats a double rainbow all the way! OMG!
Guy: Dude, have you been taking shrooms?
by Tien Fox Trot August 26, 2010