"Mhm" is a casual way of saying "yes" or "I agree" in text messages and social media. It comes from the sound "mm-hmm" and can be spelled in different ways, such as "mhmm" or "mm-hm". "Mhm" can also express acknowledgment or agreement in texts, and it is a quick way of saying "yes" or "yep". The abbreviation itself is neutral, so "mhm" can be an enthusiastic "yes" or an indifferent "yes" depending on the context. People often use "mhm" as a slightly dismissive acknowledgment, which means "I hear you, but Im not fully on board with part of this conversation". In summary, "mhm" is an interjection used to express agreement, understanding, satisfaction, or to signal your conversation partner that you are following what they are saying and they should continue speaking - depending on context and tone.