Drinking at a completely inappropriate time or in an innappropriate place, such as during class, at a funeral, in the library, during a sports match (if you are playing) nine in the morning during finals week.
This term is a reference to the Denison University Hilltoppers, the men's acappella group (who are notorious for drinking in innapropriate occasions), but honestly a good percentage of the campus is equally guilty. Plus, we love them so, so it's okay. Sort of.
Dan: Dude, did you see the kids who were wasted at the chamber orchestra recital?

Tom: Yeah, the whole string section was off. They were totally hilltopping.
by Alison Costello December 14, 2011

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