This is the 7185th most frequent Portuguese word.
leiteiro
Milkman.
In this sentence, 'leiteiro' refers to a milkman, which is a profession of someone who delivers milk.
O leiteiro entrega leite fresco todas as manhãs.
The milkman delivers fresh milk every morning.
Here, 'leiteiro' is used as an adjective to describe the truck as being designed for milk transportation.
Ele comprou um caminhão leiteiro para expandir os negócios.
He bought a milk truck to expand the business.
In this sentence, 'leiteiro' is used colloquially to describe someone as being lucky or relying on luck.