1. Describes a desire or intent to drink any alcoholic beverage, usally heavy. (Not restricted to beer!)
2. An excuse or occasion to drink.
3.a Any day that you were extreamly intoxicated on alcohol.
3.b Any day you do not remember well due to ethyl alcohol.
1.a Is it beersday yet?
1.b (Someone) What day is it? (You) Beersday!
1.c I wish it was beersday.
2.a Today feels like beersday.
2.b Its beerday!
3. Of course I don't remember, it was beersday!