Not to be confused with National Hangover Day which is January 1st. This is the day after the 4th of July which is U.S.A.'s Independence Day. It is a result of too much partying the previous day.
Person1: Man, I feel awful.
Person2: You and me both.
Person1: Oh, yea thats because its National Hungover Day...
Person2: .....
Person2: You and me both.
Person1: Oh, yea thats because its National Hungover Day...
Person2: .....
by SpoR July 5, 2007