#victor appleton

Adjective

[chok-uh-blok]

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.

Adverb

3. in a crowded manner:
    books piled chockablock on the narrow shelf.

Origin:
cf.chock close (up to), apparently as back formation from chock-full

“Quickly the enemy submarine maneuvered closer until the two craft 135 were almost chockablock.”
- VICTOR APPLETON, TOM SWIFT AND THE VISITOR FROM PLANET X