I should add, though, that I am curious how “hoity toity,” meaning “mirthful” and “giddy” came to mean “wealthy, upperclass.” I can’t find a single source, though, claiming a “high tide” etymology. I have found references to “highty-tighty,” but they’re saying that’s a variant of “hoity toity.”
This reference suggests the etymology is reduplication of the word “haughty,” which Snopes discounts.