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.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."