A hangover.
Always "tener guayabo" or "estar enguayabado." Colombians also use "guayabo moral" for the emotional hangover — the regret that arrives with the headache.
From the guava tree. One story says workers slept it off under guayabos; another links it to the sour, wrung-out feeling of the fruit.
Mexico says cruda, Spain says resaca, Chile says caña.
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