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Typically a grad student who sleeps until 3 or 4 in the afternoon on weekends, after having averaged only three hours of sleep a night during the course of the previous school week. Sleepopotami tend to congregate (often in each others beds) and multiply at prodigious rates immediately following final examination periods.
Jon: Have you seen Bill lately?

Jane: No, not since the Torts final. He's been staying up til 6am and sleeping in til 4 in the afternoon.

Jon: What a sleepopotamus.
by shoguncam July 13, 2009
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