What does palmy mean slang?

"Palmy" isn't a common slang term in modern English. It's possible you're thinking of a different word, or maybe it's a regional slang term.

Here are some possibilities:

* "Pal" is a slang term for a friend or close acquaintance.

* "Palmy" could be a shortened version of "pal," but this is unlikely to be a common usage.

* "Palmy" could be a misspelling of "palmy" which means flourishing or prosperous, usually related to a place or time.

If you can provide more context about how you heard "palmy" used, I might be able to give you a more accurate answer.