Spiff meaning : Attractiveness or charm in dress, appearance, or manner. A well-dressed man. A bonus or other remuneration, given for reaching a sales goal or promoting the goods of a particular manufacturer. Originally from textile retailing, a percentage given for selling off surplus or out-of-fashion stock, of which the sales person could offer part as a discount to a customer. (usually with up or out) To make spiffy (attractive, polished, or up-to-date) To reward (a salesperson) with a spiff or bonus. To attach a spiff or bonus to the selling of (a product) To throw; to heave. A cannabis cigarette.