Top Definition
Having intimate relations with a person residing in the same hall of your dorm/apt/etc.
Person1: "Hey, Molly is really hot."
Person2: "No way man, she's only three doors down. That's like hallcest."
by Anonymous March 27, 2003
going out with people from one's own living group
hallcest often results in bitter exes living next-door to each other, dating each other's exes, in a vicious cycle.
by pysanka June 04, 2005
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