Nouveau riche.
ETYM French, prop. p. p. of parvenir to attain to, to succeed, to rise to high station, Latin pervenire to come to; per through + venire to come. Related to Par, prep., and Come.
An upstart; a person who has just arrived in fashionable society, usually from modest beginnings.
One suddenly risen to wealth without great social rank.
Vulgar newly-rich person; upstart.