• Webster's Revised Unabridged Dictionary
    • v. t Cockneyfy To form with the manners or character of a cockney.
    • ***
Century Dictionary and Cyclopedia
    • cockneyfy To make like a cockney.
    • ***
Chambers's Twentieth Century Dictionary
    • v.t Cockneyfy to make Cockney
    • ***


Webster's Revised Unabridged Dictionary
Cockney, + -fy,
Chambers's Twentieth Century Dictionary
M. E. coken-ey, prob. lit. 'cock's egg;' cf. Fr. coco, an egg, a darling, a chap. Others would connect with Fr. coquin, a rogue—L. coquus, a cook.


In literature:

But Loch Leven is too much cockneyfied by angling competitions; moreover, its pleasures are expensive.
"Angling Sketches" by Andrew Lang
He grows the oracle of small coteries; and we can rarely get out of the impression that he is cockneyfied and conventional.
"Ernest Maltravers, Complete" by Edward Bulwer-Lytton
He takes a wider range, too wide indeed at times, since he occasionally becomes 'Cockneyfied.
"The Continental Monthly, Vol 3 No 3, March 1863" by Various
But you don't talk so Cockneyfied.
"From Squire to Squatter" by Gordon Stables