According to the Web site posted above David's excellent poem, Troca
Brazil involves an "exchange" (troca) with "A Gentil Carioca in Rio
de Janeiro."
"A Gentil Carioca" means "a gentle Carioca." Carioca means someone
from the Rio area. For other Brazilians, this is a little ironic,
since most Carioca are not considered gentle. What those chickens
may think is another matter.
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