E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
An exclamation of incredulity; a Mrs. Harris. A person tells an incredible story, and the listener cries Snooksgammon; or he replies, It was Snooksthe host of the Château dEspagne. This word snook may be a corruption of Noakes or Nokes, the mythical party at one time employed by lawyers to help them in actions of ejectment. (See STYLES.)