An exercise similar to an abdominal crunch, performed by lying flat on one´s back and then bringing the knees toward the chest while simultaneously raising the chest to meet the knees.
(slang) An opaque white chalk marble with colored stripes.
Chinnies are rodents, so they chew-chew-chew! Make sure there are no electrical cords or other dangerous or important things within reach of his teeth. 2006, Jane Harrington, Bill Henderson, Extreme Pets, →ISBN, page 69: