Top definition
When a server, who doesn't inform a guest that the gratuity has already been added to the bill...and the guest leaves a gratuity on top of the total of the bill. Usually accidental when guest pays with cash, but can happen purposely with an additional gratuity line on a credit card receipt.
"I just got a double grat on table 23!!"
by atmedved January 24, 2012
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