na-adjective, noun which may take the genitive case particle 'no', noun
high society; upper class; posh
Abbreviation of ハイソサエティ. Used as a noun or adjectivally to describe people, lifestyles, or things associated with the wealthy upper class. Often carries a slightly trendy or colloquial tone.
See also: ハイソサエティ
She always eats at posh restaurants.
That area is known as an upscale residential neighborhood.