topper-offer

From top off +‎ -er.

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topper-offer (plural topper-offers)

1. (slang) A final portion of a beverage drink, often with coffee drinks or alcoholic mixes, that will fill a cup to the top.
2. (slang) A topping on a food or beverage, such as whipped cream on a dessert, or toppings on pizza.

• top off
• topping