Meaning

adjective elegant and fashionable; ; ; ; - Julia Child

originUnknown. Most likely derived from Romani posh (“half”), either because posh-kooroona (“half a crown”) (originally a substantial sum of money) was used metaphorically for anything pricey or upper-class, or because posh-houri (“half-penny”) came to refer to money generally. A period slang dictionary defines "posh" as a term used by thieves for "money : generic, but specifically, a halfpenny or…

Etymology from Wiktionary, CC BY-SA 3.0