The song in question is “All About That Bass,” an L.A. Reid shepherded anthem courtesy of 20-year-old parvenu Meghan Trainor.
pertaining to a recent rise in wealth or position
a person who has suddenly attained wealth or position but has not yet gained acceptance in the upper class; also, an upstart who has not yet gained the manner associated with this new position
Latin per 'through' + venire 'to come'
"upstart," 1802, from French parvenu, "said of an obscure person who has made a great fortune" (Littré); noun use of past participle of parvenir "to arrive" (12c.), from Latin pervenire "to come up, arrive, attain," from per- "through" (see per (prep.)) + venire "to come" (see venue). As an adjective from 1828.