big man on campus
Sl. an important male college student. (Often derisive or jocular.) Hank acts like such a big man on campus. Let some big man on campus do the dirty work for a change.
*off campus
not located or present on the grounds of a college or university. (*Typically: be ~; live ~; move~.) Tom has an apartment off campus. The dean is off campus and cannot be reached.
on campus
located or being on the grounds of a college or university. Do you live on campus or off campus? I don't think that Lisa is on campus right now.