The phrase "curl someone's hair" is an idiom, which means to shock or surprise someone. There are several synonyms for this phrase, such as "shock someone to the core," "stun someone," "amaze someone," "take someone's breath away," "catch someone off guard," "knock someone's socks off," "blow someone's mind," or "give someone a jolt." Each phrase conveys the same idea in different words. If you want to express your amazement or shock towards someone, you can use these synonyms instead of the idiom "curl someone's hair" and add variety to your language.