make (one's) hair curl
To cause one to experience an acute feeling of shame, embarrassment, or discomfort. Her story about the disastrous wedding made everyone's hair curl. The thought of having to give her presentation in front of an audience made her hair curl.
make your hair curl
mainly BRITISH or curl your hair
mainly AMERICANIf something makes your hair curl, it makes you very shocked or worried. I could tell you stories that would make your hair curl. Some of the things I read daily would curl your hair.