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To inhale through a straw in an empty cup containing the remnants of a flavorful drink and it's marinated ice cubes. The irritating sound signals to your inattentive waiter/waitress that you are in dire need of getting your thirst quenched.
"where the fuck is my waiter? I guess it's time to bust out the refill whistle."

*Refill whistles are most effective when a waiter/waitress is in auditory range*

*if you hear a refill whistle, your tip may be in jeopardy*
by DL4Reezy August 18, 2011