Green’s Dictionary of Slang

chockablock adj.

[naut. jargon chockablock, ‘said of a tackle with the two blocks run close together so that they touch each other – the limit of hoisting’ (OED); transferred to people this became naut. sl. and thence sl.]

1. (also choc-a-bloc, chock-heaping, chuck-a-block) crammed full, crammed together; also as adv.; thus chockablock full.

[[UK] ‘Nights At Sea’ in Bentley’s Misc. May 483: He catches hould o’ the wail [i.e. veil] and hauls it up chock ablock].
[US]Melville Moby Dick (1907) 435: Those masts are rooted in a hold that is going to be chock a’ block with sperm oil, d’ye see.
[US]‘Edmund Kirke’ Down in Tennessee 108: I’s wuckd till ’bout a hour by sun, an’ hed got the cart chock heapin’ with pine knots an’ timber. [Ibid.] 160: The jail wus chock-heapin’, so they put me inter a tent under guard.
[US]G.A. England ‘Rural Locutions of Maine and Northern New Hampshire’ in DN IV:ii 70: chuck-a-block, chock-a-block, adv. Very full.
[Aus]M. Garahan Stiffs 291: Old Fergy is chock-a-block with religion.
[UK]W. Holtby South Riding (1988) 279: My dear fellow, your house is simply chock-a-block with sellable stuff. Chock-a-block.
[US]D. Runyon ‘The Lemon Drop Kid’ in Runyon on Broadway (1954) 377: The air is chock-a-block with perfume.
[Aus]‘More about Darwin’ in Mess Songs & Rhymes of the RAAF 4: They say that down below the pubs are chock-a-block with beer.
[Aus]P. White Tree of Man (1956) 82: The place was chock-a-block, what with victims and volunteers.
[UK]Picture Post 15 Jan. 16: [advert for Kellog’s] So many families who enjoy Kellog’s crisp, golden-toasted Corn Flakes [...] think they’re too good to keep only for breakfast! And so they are – tempting and choc-a-bloc with energy-giving carbohydrates.
[UK]A. Sillitoe Start in Life (1979) 24: My flesh-rod went sliding chock-a-block into her.
[UK]D. Nobbs Fall and Rise of Reginald Perrin (1976) 188: It’s the last one [...] We’re absolutely choc-a-bloc.
[UK]‘Derek Raymond’ He Died with His Eyes Open 138: You don’t go in for love [...] only hatred. You’re chock-a-block with it.
[UK]A. Sayle Train to Hell 34: Wonky containers choc-a-bloc with nuclear waste.
[UK](con. 1950s) J. Byrne Slab Boys [film script] 118: Place wis choc-a-bloc wi’ invalids.
[UK]Guardian G2 11 Oct. 7: My friend [...] found his garden absolutely chock-a-block with cannabis plants.
[UK]A. Sillitoe Birthday 170: The country must at one time have been chock-a-block with puffing billies.
Facebook 15 July [Internet] Was gonna order some tucker but the place was chocker-block, some drongo said it was bonza, but the chef couldn’t cook.

2. (Aus.) in fig. use, having sexual intercourse.

[‘Jack Saul’ Sins Of the Cities Of The Plain 21: ‘Oh! Oh! It hurts though,’ she sighed, as I pushed on, and gradually progressed little by little; still it very evidently was anything but a painless operation, to judge from her sighs and suppressed murmurs. At last, however, I was chock-a-block, as the sailors say, and she gave me a kiss of satisfaction at having achieved our purpose].
[Aus]‘Five o’clock in the Morning’ in Mess Songs & Rhymes of the RAAF 34: [He] found his wife was chock-a-block, / At five o’clock in the morning.
[Aus]A. Buzo Rooted 85: bentley: How do I know? I walked in on them, mate. richard: And Simmo was... bentley: Chock-a-block.
[Aus]B. Humphries Barry McKenzie [comic strip] in Complete Barry McKenzie (1988) 113: What if old shortarse comes in and and cops an eyeful of youse and me chock-a-block.
[Aus]Penguin Bk of More Aus. Jokes 132: [They] eventually found old Charlie with the greenkeeper chock-a-block up him.

In phrases

go chockablock (with) (v.)

(Aus.) to have sexual intercourse (with.

[Aus]B. Humphries Barry McKenzie [comic strip] in Complete Barry McKenzie (1988) 116: Musso and them bloody little nips would have [...] gone chock-a-block with all the nurses and tram conductresses.