cock·ney or Cock·ney 
(kŏknē)
(kŏknē)n. pl. cock·neys or Cock·neys
1. A native of the East End of London.
2. The dialect or accent of the natives of the East End of London.
adj.
Relating to cockneys or their dialect.
[Middle English cokenei, cock's egg, pampered child, city dweller : coken, cock (possibly blend of cok; see COCK1, and chiken, chicken; see CHICKEN) + ei, egg (from Old English ǣg; see awi- in the Appendix of Indo-European roots).]