A girl who was once unattractive but became hot and consequently started being a total bitch to everyone. Analogous and pronounced the same as Nouveau Riche.
"I thought you used to be friends with that chick?"
"Yeah but she dropped 20 and got completely Nouveau Biche."
"Yeah but she dropped 20 and got completely Nouveau Biche."
by Swinks January 26, 2010