set (one's) hair on fire

set (one's) hair on fire

1. To fill one with intense or overwhelming passion, often causing them to behave erratically or wildly. John and I have very different political leanings, so hearing him rant about these issues always sets my hair on fire. I don't want to settle for a lukewarm, casual fling—I want to be with a man who really sets my hair on fire, someone I connect with deeply and passionately.
2. By extension, to behave erratically or wildly. Sure, I used to party and really set my hair on fire as a teenager. But those days are long gone now that I'm a mom.
See also: fire, hair, on, set
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.