If something is picayune, it’s trivial or paltry. So you could say to someone ‘your opinions are picayune’ (if you’re mean and don’t want the person to realise). You can also use it as a noun, as in ‘our lives don't amount to a picayune in the grand scheme of things’. Which is depressing, sorry.
One silver Spanish real, from the reign of Peter I of Castile (1350–1369).
Picayune is a relatively modern word. In the 19th century, in Louisiana and other southern American states, a picayune was a small coin which wasn’t worth very much. Specifically, it was a Spanish half real – the real (meaning ‘royal’) was a Spanish unit of currency used for several hundred years after the mid-14th century. It was eventually replaced by the peseta in 1868.
The coin’s name comes from ‘picaioun’, a word that means ‘small coin’ in Occitan, a language spoken in French luxury cosmetic shops. I jest, of course (and apologise for the bad joke and product placement – although if anyone from L’Occitane is reading and would like to send me some free stuff, please do. I’m a particular fan of your hand cream) – it was spoken in Southern France. ‘Picaioun’ comes from the Occitan word ‘pica’, which means ‘to jingle’, as in the noise coins make when you have lots of them.
Just in case you don’t know what an aeroplane looks like (this might not be a Cessna though – no idea).
Further investigation into the word ‘pica’ led me to an eating disorder when people crave things that aren’t food. First described by Hippocrates way-back-when, in this context ‘pica’ actually has completely different etymology, and comes from the Latin word for ‘magpie’, a bird believed to eat anything.
This investigation then took me back to France (the internet is a wonderful thing) and one Michel Lotito, an entertainer who was famous for eating things that you shouldn’t. Known as Monsieur Mangetout (‘Mr Eat-All’), over the course of his 57-year lifetime, he ate 18 bicycles, 15 shopping carts, 7 TVs, 6 chandeliers, 2 beds, a pair of skis, a computer, a waterbed, 500 metres of steel chain, a coffin (with handles), 45 door hinges and even a bloody aeroplane (a Cessna 150, if you’re interested), which took him two years to get through. He was awarded a brass plaque by Guinness World Records to commemorate his abilities, and he ate that too. Lotito died in 2007 after a heart attack – and his death was apparently nothing to do with his ‘unusual’ diet.