The opposite of
morning after where an individual feels fine without any
headaches or such before he/she parties and gets drunk all night long. Unlike the morning after, where you have to deal with killer headaches, you will feel normally fine, only to realize that you were later invited to a party to get
crossfaded or drunk.
I spend the
morning before doing my homework for chemistry in college, but after I was invited to that party last night, I had to deal with killer headaches and needed pain
reliever.