A Spiff

1. (uncountable) Attractiveness or charm in dress, appearance, or manner.
2. (countable, archaic, slang) A well-dressed man; a swell.
3. (countable, commerce, slang) 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.
4. (countable, colloquial, Jamaica) Alternative form of spliff (“hand-rolled marijuana cigarette”)