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Bandera de Colombia

/Sounds like "ma" (as in "mama") + "mer" (as in "mercy") + "to" (as in "tostada" without the "stada")/

A fool, a naive or clueless person who never catches on to what's happening around them. In Colombia, it describes someone who's too innocent for their own good, always the last to realize they're being tricked or taken advantage of. It's dismissive but not the harshest insult, more like calling someone gullible or dense.

Example

"No sea mamerto, ¿no ve que lo están robando? -> Don't be an idiot, can't you see they're ripping you off?"

"Ese mamerto se creyó todo lo que le dijeron. -> That fool believed everything they told him."

Regional synonyms:

Puertorriqueño, persona de Puerto Rico. Viene de Borinquen, el nombre taíno original de la isla, y es un gentilicio que los puertorriqueños llevan con orgullo infinito: lo tatúan, lo cantan y lo gritan al mundo.