Silverware Check

Used amongst employees of the service (bartender, waiter, busser, etc) field. Meant to bring attention to a certain customer present at a table, booth, counter, or elsewhere within the property for a visually obvious reason without arising suspicion amongst the patrons.

Busser: Silverware check table 85.
Waiter: Holy shit, you can see her tits from here!

Busser: Silverware check the bar top, pretty sure the female at the end isn't old enough to order juice, let alone a drink.