an annual celebration that takes place on October 21 celebrating orchards of blossoming apples every fall; celebrations include the making of apple cider and various 'apple based' games (usually takes place in United Kingdom)
To wakeup so hungover in albany that when you see a congregation of pumpkin fuckers bobbing for apples under a tree on a rainy sunday dusk, your first thought isnt that its earthday or labor day or whatever the fuck holiday people decide to worship trees and apples. Instead you scream out in a loud mickey mouse type tone "happy apple day" to every person you see on the way back to your room/wendy's.
I almost flabbergasted when i found out it was appleday... happy apple day, happy apple day, happy apple day...
Apple day is code name for when you and your friends are going to pull a pretty awesome prank. Derived from pranks of throwing large amounts of apples at cars.
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.