zero chill

noun4

1. •
   (informal) Inability to be calm or rational.

   • "Sam, I think we need to discuss your chill factor. Right now you're on like zero chill. It's just not going to do." — 2007
2. •
   (informal) Lack of any good qualities.

   • “So dad can't get here?” She added some shrill tones into the rising outrage. “Zero chill.” — 2015
3. •
   Cold temperatures of approximately zero degrees.

   • These nitrifying homes will act in any climate, provided they are guarded from zero chills. — 1909
4. •
   The property of a casting having no chill (hardened surface).

   • As the carbon equivalent increases, the depth of the chill decreases until the entire sample is gray, showing a zero chill measurement. — 1960