To make (someone or something) very excellent, stylish, or attractive in appearance. A noun or pronoun can be used between "spiffy" and "up." I hired an interior decorator to spiffy up the house. I love to get spiffied up before a big night out with my friends. You could really stand to spiffy your wardrobe up a bit.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.