"Pangit ka" is a Filipino equivalent of "You're Ugly." Most non-Filipinos won't react if they see this on your shirt. And if they ask what this means, just say "You're Handsome/Beautiful."
Sounds weird? Yeah. But in reality, this happens in the PI. When you go visit the Philippines, beware of Filipinos teaching you Tagalog words. More often than not, they're vulgar words. Just make sure you know their meanings, before you even dare uttering them in public. Gee, Pinoy humor.