This is the 6730th most frequent Portuguese word.
gastão
A person who spends excessively; spendthrift.
Here, 'Gastão' is used as a proper noun, referring to a name.
Gastão é um nome comum em algumas regiões.
Gastão is a common name in some regions.
In this sentence, 'gastão' is used as an adjective describing someone's characteristic of spending excessively.
Ele é muito gastão e sempre compra coisas desnecessárias.
He is very spendthrift and always buys unnecessary things.
'Gastão' in this context is an adjective describing an engine that consumes a lot of resources.