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.
The gaudy gold decorations in his house are a perfect example of nouveau riche taste.
He showed up at the party in a vulgar, flashy outfit.
成金 means 'nouveau riche' (a person), while 成金趣味 refers to the tasteless aesthetic associated with such people.
悪趣味 means 'bad taste' in general, whereas 成金趣味 specifically implies the ostentation of the newly wealthy.
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.