cocker, adj. — Green’s Dictionary of Slang

cocker adj.

[Edward Cocker (1631–76), an engraver and teacher, the writer of Cocker’s Arithmetic (published posthumously in 1678)]

calculating.

1821

Egan Life in London (1869) 93: The diamond necklace of the duchess did not operate more strongly on his cocker feelings, than the poor market-woman’s flat iron to raise the needful to commence her daily business.