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A hippopotamus that is tripping on psychadelic drugs such as LSD or Pscillocibin mushrooms. They commonly reference "trippin' balls" and "Grateful Dead laser shows".
I took mushrooms at the Bassnectar concert with a Trippopotamus that kept telling me about the Grateful Dead laser show he watched last week.
by Jewboy, Beeeeen, and Mel Mel February 28, 2010