What does MCM mean? Man Crush Monday or Man Candy Monday MCM is a popular hashtag used on Instagram. The acronyms is also used on Facebook, Twitter, and Tumblr. Users use #MCM when they post photos of men whom they find attractive. MCM stands for both ‘Man Crush Monday’ and ‘Man Candy Monday’ and is usually uses in a fun, light-hearted way. This is very similar to WCW, or Woman Crush Wednesday, where users upload photos of women whom they find attractive.