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!
when an upper classman or group of upperclassmen designate a day to go beat the living hell out of any underclassmen that gets in there way or just looks like they could use a good beating
Somethingpeoplesay to feel like they've matured and grown when they truly have not.
Person 1: Back in our hayday we didn't get this much homework.
Person 2: You fool, what hayday? We always got this much work!
Person 1: Oh yeah. What's wrong with me?
Person 2: My thoughts exactly.
Person 3: Did someone say hayday? I was quite the baller in mine.
Person 1: Go away dude.
Person 2: Yeah nobody asked you!