An inflatable jumper half-filled with mentally diagnosed retarded adults, and half-filled with conscious thinking adults, all having sex with the other, with the female partner bouncing as high up and down as they can on the male genitalia.
Morgan: Hey David, Samantha invited me to a GumperJumper tomorrow night, wanna go have sex with some normal people?
David: eughh uhhhhh ergummmm yeth David I wan go thumping with yew.
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."