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In Mexico it is a 1.20 liter bottle of Carta Blanca beer.

It comes from "caguama," which is a sea turtle, and is also the name of the .940 ml bottle of Carta Blanca, and a suffix which means "big."
Se me antojó un caguamón — I feel like a beer

Vamos por unos caguamones — Let's get some beer
by Inco October 11, 2007
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