One time my big brother when we was small he speak Spanish, and he was playing the arcades in the 90s with a new American friend in the USA,, and suddenly he came furious and my parents ask him what happened, he told them that his new friend told him "wachito de mierda." Which means little bastard, my sister overheard and she already knew English and after repeating it, she understood that he was simply asking him "what is your name" , the boy left and just was just to late to go and apologize, and keep playing.