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What does HM stand for?

HM stands for Horse's Mouth

This definition appears very rarely and is found in the following Acronym Finder categories:

  • Slang/chat, popular culture

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Other Resources:
We have 48 other meanings of HM in our Acronym Attic

Samples in periodicals archive:

People know what I'm like with refs but it was good to hear a few things from the horse's mouth, although he didn't change my mind about anything I've seen.
Tony is heavily involved in The X Factor so we can find out the tears and tantrums straight from the horse's mouth Tony - Tears and tantrums?
It's nice to get it from the horse's mouth, as was the case with Jimmy Braddock who lost his world championship to Joe Louis.