Exclamation made by an idiot who fails to check their autocorrect but goes ahead and sends a reply-all, resulting in mass confusion, wasted email inbox space and egg on their face.
CMO woo boo.
I sent an email after happy hour and accidentally hit reply all. Woo boo.
When you're coming down from being high off of drugs, or you're not feeling the full potential of your high, you take some more (drugs) for a "woo boost"!
Frank: "Man, I'm not feeling this ecstasy that well..."
Ted: "Oh, I'm sorry man! Do you need a little woo boost to help you out?"