1 definition by Drpepperx

Top Definition
When it Hays a lot during the night and then the next day there is so much hay you can not get out of your house. And as such you have a totally awesome time.
Dude1:Dude! We got a hayday today!
Dude2:Yea dude these come once in a blue moon!
by Drpepperx December 13, 2010

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