I tried icing the fat underneath my chin for an hour and a half.

Freezing externally will not help the internal fat and only potentially cause your to burn your skin.  Best, Dr. Emer.

I would not recommend doing this on any area of the body as you can damage your skin and underlying anatomy. Remember Cool Sculpt has been studied for years and has found to be safe in the right patient using safe and recommended settings. Remember to keep safe and do not try this again at home.