Galactic, interplanetary word for a friendly well wishing hello, hi ya, hows it going, greetings, well tidings, howdy de do. It's hi with excited anticipation for good things to come.
Because it crosses all earth language barriers, the subtle meanings and interpretations are all in the tonal quality and pronunciation of the "oo". The longer, the friendlier. But the basic overal tone carries the feeling "hi, we meet, more good stuff will now happen" This understanding transcends all misunderstandings that have every happened prior anywhere or anywhen.
Oozaga, nice to meet you.