So I work at this great restaurant as a busboy and we always get HB inside.
How would you guys suggest I open them while im working?

I'm not a newbie exactly but not a guru either so this might not help much mate. But if it were me I'd try to come across as that one cool hot busboy that seems to understand women. For instance I would go straight into cocky funny mode and when they ordered something I'd repeat their order except maybe say "Ok that would be everything on the menu. Jesus your really hungry! Joke joke, I got ya sweety."
twist their words around in a flirtatious way.

I'd also make a comment about anything on their appearance be it a ring or a neckless. Hair etc.. If I notice something on their clothes I kindly pick it off and say "Ladies have to look there best so I'm helping you out"

But do it in a none lingering way. Since you still have a job to do. Almost like your just fucking with their minds to past the time at work. Cocky funny always works for me.