What does "mhm" mean in text?

When "mhm" is written in a text message, it means that the person agrees with what another person says. It is a texting and Internet slang way to reply "yes," "uh huh," "I agree," or "ok" to someone else.

The texting term "mhm," when sounded out, sounds like the humming sound "mm-hmm" that someone makes with his mouth when nodding and agreeing with someone else.

There are also several less common usages of "mhm" in texting and abbreviated Internet slang. Other usages of "mhm" include "members helping members," "mile high music," "married Hispanic male," "melon head man" or "metal heads mission."