1967 in reference to a simple style of clothing popularized in the West and based on dress in Communist China, from French, from name of Mao Tse-tung (1893-1976), Chinese communist leader.
Central American nation; the name is used of a political jurisdiction by 1530s in Spanish, probably from an unknown Guarani word, traditionally said to mean "place of many fish." Originally the name of the settlement founded 1519 (destroyed 1671 but subsequently rebuilt). Related: Panamanian. Panama hat, made from the leaves of the screw pine, is attested from 1833, a misnomer, because it originally was made in Ecuador, but perhaps so called in American English because it was distributed north from Panama City. Panama red as a variety of Central American marijuana is attested from 1967.
"piercing that consists of a ring which goes through the urethra and out behind the glans," mid-20c., supposedly so-called from the modern legend that Albert of Saxe-Coburg-Gotha (1819-1861), prince consort of Queen Victoria, had one.
But the term seems to be not older than bodyart maven Doug Malloy and his circle, and the stories about the prince may be fantastical inventions, perhaps to explain the term. Perhaps, too, there is some connection with Albert underworld/pawnshop slang for "gold watch-chain" (1861), which probably is from the common portraits of the prince in which he is shown with a conspicuous gold watch chain. Many fashions in male dress made popular by him bore his name late 19c.