Of unknown origin, but having been popularized (as Kowa-Bunga) by Chief Thunderthud on the American children's show Howdy Doody in the late 1940s or early 1950s, and became associated with American surfing culture. By the early 1980s, it was used as the catch-phrase of Cookie Monster on the American television show Sesame Street, and gained popularity with a broader audience after its use in the American cartoon Teenage Mutant Ninja Turtles in the late 1980s and early 1990s. (For further treatment, see here.)
This was a term used by Chief Thunderthud on the Howdy Doody show in the fifties. It was picked up by surfers in southern California in the late fifties, then skateboarders. Not Swahili, not Hawaiin, not Mutant Ninja Turtles - Howdy Doody.
The act of masturbating in the tune of the theme song of Teenage Mutant Ninja Turtles. Finally you ejaculate as the theme song says "Turtles in a Half Shell."
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the USCoast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."