Where did that term come from anyways?????
Here is an explanation, from answerbag:
“Back in the mid-19th century, the U.S. was awash in polka dots, that pattern of dots of uniform size and arrangement, because we had all gone polka-crazy. The polka, of course, is a simple, lively dance step that took Europe and America by storm soon after its introduction in 1835. The name "polka" is a minor mystery. Although "polka" is Polish for "Polish woman," the polka dance is actually of Bohemian origin, and "polka" may be a corruption of the Czech word "pulka" (half) referring to the short half steps involved in the dance.
None of which, I realize, explains polka dots, but I’m getting to that. At the peak of the polka craze, from about 1840 to 1890 (this was a very long craze), a variety of manufacturers cashed in on the public’s polka-mania by naming a dizzying range of products after the dance. Polka hats, polka gauze, polka curtain ties, and, of course, polka-dotted fabrics, had little or nothing to do with the dance, but sold like hotcakes, for a few years anyway. The polka dot pattern, however, had staying power, and remains popular today, especially in neckties. “