noun, noun which may take the genitive case particle 'no'
nouveau riche taste; vulgar display of wealth
Refers to the ostentatious, often gaudy aesthetic associated with the newly rich; carries a negative, mocking tone.
彼の家の金ピカの装飾はまさに成金趣味だ。
The gaudy gold decorations in his house are a perfect example of nouveau riche taste.
成金趣味な服装でパーティーに現れた。
He showed up at the party in a vulgar, flashy outfit.
Compound of 成金 (なりきん, 'nouveau riche') and 趣味 (しゅみ, 'taste'). The term 成金 itself derives from shogi, where a promoted pawn becomes a gold general (成金), metaphorically applied to someone who suddenly becomes rich.