This is the 3702nd most frequent Portuguese word.
virei
"Virei" means "I became" or "I turned" in English, depending on context.
In this sentence, "virei" is used to express that the subject turned or changed direction.
Virei à direita na esquina.
I turned right at the corner.
Here, "virei" indicates a transformation or change in state, from a learner to an expert.
Estudei tanto que virei um especialista no assunto.
I studied so much that I became an expert on the subject.
In this context, "virei" shows a change in personal preference or allegiance toward becoming a fan.