What does garbh mean in Gaelic?

There's no word "garbh" in standard Gaelic (either Scottish Gaelic or Irish Gaelic). There's a strong possibility you're thinking of a slightly different spelling or a related word.

The closest possibilities, depending on the intended meaning, might be:

* Garbh (Scottish Gaelic): This means "rough," "coarse," "uneven," or "wild."

* A variation in spelling or pronunciation: There might be a dialectal variation, a misspelling, or a related word you've encountered.

Could you provide more context? Knowing the sentence or phrase where you heard/saw "garbh" would help clarify the meaning.