make someone's hair curl
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 someone's hair curlshock or horrify someone. informal
This expression may have developed in the mid 20th century as a dramatic or humorous variation of make someone's hair stand on end (see hair).