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A Maconheiro is someone who either sells drugs or gets high so much they forget their own name and their mom's face.
I saw a Maconheiro on the bus who was eating a sandwich and also doing a line of cocaine at the same time.
My cousin is a Maconheiro. He turned my dog into a crackhead.
The Maconheiro at the corner store will sell you weed or tell you his life story, both are pretty sad.