1. extremely full; crowded; jammed: a room chockablock with furniture and plants.
2. Nautical. having the blocks drawn close together, as when the tackle is hauled to the utmost.
3. in a crowded manner: books piled chockablock on the narrow shelf.
Origin: compare chock close (up to), apparently as back formation from chockful
Now YOU come up with a sentence (or fic? or graphic?) that best illustrates the word.