bossa

In Brazil, the word "bossa" is old-fashioned slang for something that is done with particular charm, natural flair or innate ability. As early as 1932, Noel Rosa used the word in a samba:
"O samba, a prontidão e outras bossas são nossas coisas, são coisas nossas" ("The samba, the readiness and other bossas are our things, are things from us").
The exact origin of the term "bossa nova" still remains uncertain. Within the artistic beach culture of the late 1950s in Rio de Janeiro, the term "bossa" was used to refer to any new "trend" or "fashionable wave".