dormcest n. (at a university or college) a romantic or sexual relationship with a person who lives in the same coed residence hall. Also hallcest, floorcest. (source: Double-Tongued Dictionary)
Further reading
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“Dormcest” and “floorcest” were definitely in use in ‘93 at the Ohio State University. No citations to offer, but I heard it plenty when I started dating a girl from my floor.