This phrase is used to imply that if someone gets annoyed or defensive in a situation, it's because they feel guilty or know that they are in the wrong. It literally translates to 'the one who gets stung is because they eat chili [garlic]'.
Examples
- Spanish: Juan siempre se enfada cuando hablamos de su novia. El que se pica es porque ají come.
- English: Juan always gets angry when we talk about his girlfriend. He who gets stung is because they eat chili.