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Meaning:
CALA BOCA GALVAO = SHUT UP GALVAO
GALVAO = Galvão Bueno, Brazilian Soccer narrator/commentarist who has been in TV since Brazil's first soccer game (that's a joke, ok?), and person who gets to speak during all World Cup games, and other sports on the Brazil's main television channel, Globo. Brazil is pissed of, he's fucking annoying.

That's all.