A mexican variation of the Italian expression Ciao, meaning hello whats up sexy or goodbye see you later. The major difference is that the mexican expression is very blunt and obvious in its flirting. Usually in a humorous and playful, flirty context.
Vato 1: "Hey fool here comes Beto's cousin, the real fine one!"
Vato 2: Wha?.. where?...oh shit! CHEEOW!!! damn ]baby girl]!!! Hey Claudia... Hey... HEY CLAUDIA! Yo come over here and kick it with us! HEY! ... Hey, tell your girl she's looking super fine! YEah, let me get those digits! etc. etc...