hmu text meaning in chat and how to use it The internet is full memes and consists of confusing slang. One term you may have come across is the HMU. It's everywhere: social media, chats, text messages, and even dating apps. But what does the HMU text mean? HMU is the acronym for Hit Me Up. It's an invitation for someone to contact you. Often not capitalized, as is the style these days. The original context of using the word and saying "hit me up" to someone is when asking for something like it can be used in the context of money. Example: "My brother hit me up because his business went bankrupt."