It was a way of offending The Boca Juniors fans. The word bostero means that he walks among the droppings of stables ( bosta ), either cow or horse. The term is used by rival fans in their chants. The original term was botero (boat) because there in the neighborhood of La Boca many people related to them, making them, painting them or driving them. It was required to pass the river daily (Arroyuelo). Today fans do not take it as an insult, but it is a source of pride and is like a brand of origin.
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