Word Origin & History
coke
1699, northern Eng. dial., perhaps a variant of M.E. colke "core, charcoal," itself possibly related to -colc, an O.E. word for "pit." The soft drink name is a shortening (first recorded 1909) of brand name Coca-Cola, trademark from 1887. As a shortened form of cocaine it dates from 1908, Amer.Eng.
[kohk] 
Slang.