MCM

When you post a picture of a man with whom you have a crush (usually a celebrity) on your social media sites.

Man Crush Monday is considered an Internet theme day, observed every Monday, during which people (women and men) post pictures of the men they like on their Facebook, Twitter, Tumblr, Instagram, etc., accounts. You'll often see the hashtag #mancrushmonday trending online, indicating a lot of people are posting their crushes.

Online jargon, also known as text message shorthand, used in texting, online chat, instant messaging, email, blogs, and newsgroup postings, these types of abbreviations are also referred to as chat acronyms.