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1.
When you do someone the favor of bringing them food, such as waffles (reasons include too tired or too lazy to get one's own food) - it is OK to take a bite as a tax for the food delivery service. Out of courtesy, the server will first ask - whether waffle tax is OK.
Kid: Mom? Can you please bring me some waffles?

Dad: Get your own, you're old enough.

Mom: Sure, I can get you some. Is waffle tax OK?

Kid: Sure, Mom. Don't forget the syrup!
by Concepcion Perez August 05, 2007