from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Squeezed together; jammed: The cheering fans were chock-a-block in the stands.
- adj. Completely filled; stuffed: "I recommend the north shore chowder, chockablock with pieces of seasonal fish” ( Charles Monaghan).
- adj. Nautical Drawn so close as to have the blocks touching. Used of a ship's hoisting tackle.
- adv. Chock: a hall that was chock-a-block full.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Alternative spelling of chockablock.
- adv. Alternative spelling of chockablock.
Alteration (influenced by chock) of block-a-block : block + a-2 + block.(American Heritage® Dictionary of the English Language, Fourth Edition)