General Brazilian
debate casual / discussão informal
Most commonly used in casual contexts among friends and family
Rio de Janeiro
conversa de boteco / bate-papo
Often used in bar or informal neighborhood settings
São Paulo
debate casual / discussão informal
Standard usage in professional and casual contexts
Portugal
discussão informal / conversa descontraída
Less commonly referred to as 'debate casual'; more often 'conversa' or 'discussão'