Top definition
The act of (or a person) being in a mood where everything is uncontrollably funny.
OR
The act of laughing at everything whilst doing a pointless activity.
"Ted, did you see Clare this morning she was in a gadyfun mood".

"I was a gadyfun last night at Anastasia's party, I laughed uncontrollably whilst making paper planes".
by Apples.and.Oranges. May 27, 2011
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