1. "HM" can stand for "high maintenance" on Snapchat. "High maintenance" usually describes someone who needs a lot of attention or has particularly expensive ... 2. "Hm" is also a term used when someone is thinking. Essentially, "Hm" is spelled out to represent the sound that people make when they're lost in thought. It ... 3. “HM” means “high maintenance” over text too. When someone sends a capitalized HM over text, they’re likely talking to you about a person with demanding ...
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