Polka Dots, an early 1900's fashion statement, are often labeled as retro. Not only are they back in style, but are seen as more than just dots. Replacing the dots with hearts, we have polkahearts, seen on some less than common articles of clothing.
Bro: Hey how did things go with that girl last night.
Bro Two: Let's just there were polkahearts on her panties.
Bro: Shameless bro, sweet.