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The colloquial or informal term highfalutin (from high fluting) means pretentious, as with wealth.
"My aunt has this highfalutin attitude now because she married a wealthy man and has a house in the Hamptons."
Highfalutin
"pompous; bombastic; haughty; pretentious"
hoity toity. when you act all posh and superior.
pretentious, highfalutin'