When you greet somebody, say "Ah Ba!", raising the
tone of "Ba" to express that you're glad to see the person.
Ah BA! is generally shouted out
loud, because basically you don't give a shit about who's around you because the chances are they haven't a clue what you're on about, but the person you're saying it to
already knows what it means..
"Ah Ba" can be said in any
tone, generally to show how you're feeling, which is followed up with "What's
wrong with you Ba?" or "Story Ba?"
To explain to somebody how hungover you are, just say "ah.. ba..." in a really
tired tone, just to show how fucked you are.