chock-a-block

from WordNet (r) 3.0 (2006)

chock-a-block
    adv 1: as completely as possible; "it was chock-a-block full"
           [syn: {chock}, {chock-a-block}]

from The Collaborative International Dictionary of English v.0.48

Chockablock \Chock"a*block\, a. (Naut.)
   Hoisted as high as the tackle will admit; brought close
   together, as the two blocks of a tackle in hoisting.
   [1913 Webster] Chock-full