Its statement will come to you if sometime you come to Bali as a visitor. Here is style of child-sellers expression to sell Bali products to be bought by any travellers, including you. All of accessories or something about that are part of boys or girls activities around Bali beach.
Firstly you will be surprised to hear a unique-English-expression because that does not meet to the role of English grammar, but for Baliness the most important thing is language they tell as intimate as to you for a closed expression.
Buy me sir means they sell something and you buy it. Do not think in negative or sensual messages. They just do not what structure to create, that language doen not refer to sell their body or something about their life privacy.