Name for a March-May Blizzard, one day it's nice, sunny and 70 degrees, the next day it's a white-out. The weather bitch slaps your brain, and makes it difficult to concentrate, among other things in Colorado that are already distracting you, for example, legalized Marijuana.
Man, I was going to go for a killer climb, hike and bike today, but we've experienced a Colorado Bitchslap, so I'm going to do nothing, except watch my car experience a Colorado Carwash.
Combination of the term bitch, which means someone who complains, yells, and is always in a bad mood, and retard, which means someone who consistently does incredibly stupid things.
Definition: A whiny and bitchy person who is constantly acting like a retard.