When you wake up and your hair is just plain awesome, all on its own, for no particular reason. No matter how much it
rains, you sweat, or you get
punched in the face, your hair remains
rad until the end of the allocated 24 hour period.
Dude I'm totally having a rad hair day. We just
experienced a Jumanji-level
stampede and I still look like
David Hasselhoff.