To pretend to be on a college visit at Lehigh University in hopes of having secretive homosexual intercourse.
Person 1: I hear Jude and Mike are on a college visit to Lehigh University.
Person 2: Not actually...they're Lehighing.
Person 1: What? Like the University?
Person 2: They're Lehighing each other...they're pretending to be on a college visit, but they're secretly having gay sex.