prep·py or prep·pie 
/ˈprɛpi/ noun
plural prep·pies /ˈprɛpi/ noun [count] US, informal + often disapproving : someone who dresses or acts like a student at a prep school (such as by wearing neat, somewhat formal clothing or by using particular words and phrases)
▪ a rich preppy
▪ a rich preppy
— preppy or preppie adjective
▪ preppy clothes
▪ preppy clothes
