Try this in front of your girl and see if you can get away with it...Next time you are out, when the waitress is asking you about your order, look at her hands (or a tattoo on her arm, neck) if she has nice nails or a nice ring, make a comment about it, a nice flirty one...usually do this when her hands are near your personal space on the table. The normal thing people do is hld out their hand, place your hand underneath of hers (if you can) and act like you are admiring it, continue with "flirty talk", but act like you are truly interested in that ring or her nails...as she leaves, make a comment to your woman like, "I really like the detail of her nails, didn't you?" or "that was a nice ring, don't you think?"
either you will get a reprimand, with a smirk, or she will be pissed, or she may not notice...
All responses will tell you a shit load about yourself and your "flirtiness"...