Animal is, most of the times, food? Because of this that Ha'DIbaH can means "An animal" and "meat"?
What is meat but animal matter? When a Klingon speaks of eating meat, they literally speak of eating animal.
Fun fact about the word Ha'DIbaH (and why it's so long, for Klingon):
When it was first said on screen, the actor said the word in English, "animal!" They wanted to dub it over in Klingon, so Marc Okrand had to make up a Klingon word that would match the lip movements, but sound different. He switched a -> Ha', ni -> DI, and mal -> baH.
Maybe that will help you remember the word.