Cast a Kitten = have kittens. to express ones anger, anxiety, fear, excitement, amusement or the like, especially violently; to have a fit.
Image found at Square America
Example: We were having a gay old time until Mavis opened her trap and cast a kitten about the way Pearl dances...you know, two left feet? Anyhow, before anyone knew it, Pearl was howling and Clarence was on top of Wilbur trying to put his eyes out! Mavis never knows when to keep her darned mouth shut.
Clarification: We were all quite enjoying the company of one another until Mavis loudly exclaimed that she was not satisfied with the talent Pearl showed on the dance floor. Just between us, Pearls dance moves are of a highly inferior quality. Nevertheless, the prevailing psychological state changed very quickly and Pearl began to express emotional pain, grief, and distress by weeping and sobbing and Clarence was laboriously trying to extricate Wilbur's eyes. It was beyond understanding. I declare, Mavis never exercises tact when speaking aloud.