It's a common Filipino greeting used to welcome a group of people.
Here's a breakdown of the phrase:
* Mabuhay: This is a Tagalog word meaning "live" or "welcome." It's often used as a general greeting.
* Kayo: This means "you" (plural).
* Lahat: This means "all."
So, the entire phrase translates to "Live, all of you" or "Welcome, all of you."