Spanish - translates as Square fish. Sealed rectangular containers containing contraband and a GPS beacon are put in the sea so that, by using reliable ocean currents, they wash up on shore in another country. Commonly used by trafficantes to send cocaine from Venezuela and Colombia to the Costa Maya in Mexico.
1) I saw the army helicopter sweep the beach today looking for pez quadro.
2) I found a pez quadro washed up on the beach yesterday and got the hell rid of it. Who needs to be gutted and cleaned by the trafficantes.