A student at the University of Pennsylvania who transfers into the university's Wharton School of Business after a year at another of the schools, most typically the undergraduate College. Wharton expects a first-year GPA of 3.7 to allow transfer. A student often does this because it is seen as easier to accomplish than to be admitted to Wharton straight out of high school. Wharton has higher SAT and GPA expectations for students than Penn's other schools - the College, Nursing, Engineering, etc.
"Hey Mark, why are you taking such bullshit classes your first semester at Penn?"
"Shh, I'm trying to be a backdoor Whartonite. That's why I'm taking Sociology 001, a writing seminar, American Music History, and Intro to Japanese Culture."