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To make someone, something, or oneself appear more visually attractive, appealing, or fashionable. In this usage, a noun or pronoun can be used between "spiff" and "up." They spiffed up that ramshackle old building—it's so hip and modern looking now! Tommy and Sarah are going to help spiff me up a bit before my date.
Made to look more attractive, fashionable, or appealing. I like how spiffed out this place looks since you guys took over. I like getting a little spiffed up for a night on the town.
dressed up, groomed, and polished up nicely; clean and tidy. See if you can get yourself a little spiffed up before we go out to dinner. We wouldn't want the Wilmington-Thorpes to think you only have one suit. The house doesn't have to be too spiffed up for the Franklins. They are used to clutter.
mod. dressed up, brushed up, and polished up nicely. See if you can get yourself a little spiffed up before we get to the front door. We wouldn’t want the Wilmington-Thorpes to think you only have one suit.