Chock'a·block adjective (Nautical) Hoisted as high as the tackle will admit; brought close together, as the two blocks of a tackle in hoisting. Found on http://www.encyclo.co.uk/webster/C/69
extremely full; crowded; jammed: a room chockablock with furniture and plants. · having the blocks drawn close together, as when the tackle is hauled to the utmost. Found on https://www.infoplease.com/dictionary/chockablock