Definitions from Wiktionary (picayune)

▸ noun:  (especially Louisiana, historical) A small coin of the value of six-and-a-quarter cents; a Spanish coin with a value of half a real; a fippenny bit.
▸ noun:  (by extension, archaic) A coin worth five cents (a nickel) or some other low value.
▸ noun:  (figuratively, informal) A person regarded as unworthy of respect or useless; also, something of very little value; a trifle.
▸ noun:  (figuratively, informal) An argument, fact, or other issue raised (often intentionally) that distracts from a larger issue or fails to make any difference.
▸ adjective:  Of little consequence; small and of little importance; petty, trivial.
▸ adjective:  Childishly spiteful; tending to go on about unimportant things; small-minded.

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