What is "casu"

Usage examples of "casu".

He was totally unfamiliar to her, dressed casu all in well-worn and very faded blue jeans, and a short sleeved shirt that acknowledged the heat of the glo nous summer they had been enjoying.

He was dressed casu ally for the journey, a cream woollen shirt tucked into stone-washed jade-green jeans.

He casu- ^^ tossed a dead quail at my feet, then slunk off into the s^d^wing shadows to gnaw at a second, larger bird.