It is a very old Americanism to call the pit, today is a lack of spelling. The wrong query can be also by fleshy, caloso, grizzled. . .
It is walnut or bone of a fruit, such as peaches or plums. Italian surname. Surname of a dance teacher named Italian Fabritio Caroso da Sermoneta. a person who makes many faces or gestures.
Caroso, sa: in Peru, blonde, faded.