“Heo” is a Vietnamese word meaning pig, which is fully described as “cong heo”, or “the pig”. Asian people (esp. Vietnamese) say “What the cong heo?!” just because they think it’s cool and sounds funny, but really, it only makes them look like a complete retard that should go finish their ELD classes.
FOB 2: What the cong heo?!
Bystander: STFU retard.