What does "racy" really mean?

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Dear Dr. Vinny,
I see the term "racy" used a lot in the tasting notes of Wine Spectator. What does this adjective really mean in the context of smell and taste?
—Not So Fast, New York
Dear N.S.F.,
"Racy" refers to a style, not a smell or taste. A racy wine has lively acidity. It's not going to be thick or heavy, it's going to be juicy and light. To give you some non-wine context, a tart, mouthwatering lemonade is racy compared to a thick, creamy milkshake.
—Dr. Vinny