From the Oxford Dictionary
Definition of crazy
- adjective (crazier, craziest): mad, especially as manifested in wild or aggressive behaviour.
- archaic (of a ship or building) full of cracks or flaws; unsound.
We've all had our moments of crazy. Little peeks behind the sanity curtain. In context, it's fine, like screaming like a banshee at the television during the substitute for paleolithic aggression we call sports.