On the Internet, a WCW refers to a Woman Crush Wednesday. This generally involves users of a social networking site, such as Instagram or Facebook, posting photos of women that they may have a crush on. These photos could be of their significant others or of celebrities.
In addition to WCW is a day known as MCM, or Man Crush Monday. This is a similar practice to Woman Crush Wednesday, with the main difference being that the photos are of men instead of women. Flash Back Friday, or FBF, is another popular option that involves posting photos from a person's past.