New word

I've coined a new word. There's a point when petting my cat, Mr. Kitty, that goes beyond mere contenment. He's not just enjoying a little affection. His whole being is involved. He gets so happy that he almost convulses as he purrs. There are snorting sounds coming from him; deep, throaty, gutteral noises; involuntary movements, his body almost convulses.

The new word for this?

Purrgasm