What does moo mean in Filipino?

"Moo" doesn't have a specific meaning in Filipino. It's the sound that cows make, and that's how it's understood in the Philippines too.

However, if you're thinking about a specific word or phrase that sounds similar to "moo", it might be helpful to provide more context or details.

For example, are you thinking about a slang term, a specific word used in a particular region, or something else entirely?