WCW stands for Woman Crush Wednesday, the knockoff of #mcm, or Man Crush Monday. It originated on twitter, the social media app. You would say #wcw on Wednesday if you were naming your crush on a post/tweet/blog.

v. collectively or individually finding someone/something to blame for a problem, as opposed to brainstorming which connotes finding solutions to a problem

n. the act of finding someone/something to blame for a problem

(from a TV ad for HD television)