In Spanish slang, 'ácido' is used to refer to someone who is sarcastic or has a sharp or biting sense of humor. It can also refer to a situation or comment that is harsh or cutting.
Examples
- Spanish: No te ofendas por su comentario, él siempre es así, muy ácido.
- English: Don't get offended by his comment, he's always like that, very sarcastic.