Green’s Dictionary of Slang

(orig. naut.) fed up, disgruntled.

1945		D. Bolster Roll On My Twelve 32: Jackson [...] was so chocker with all this that he went ashore and bought the Mug.
1958		F. Norman Bang To Rights 130: Well to tell you the truth old chap I’m a little chocker of this place.
1999		K. Sampson Powder 288: Peter and Keith an’ ’at’ll be chocker if we don’t go down!
2001		K. Sampson Outlaws (ms.) 6: A lot of the time since then I have felt chocker about some of the jobs we’ve pulled.