(in Hudibras). A contraction of Smectymnuus, a word made from the initial letters of five rebels- Stephen Marshal. Edward Calamy. Thomas Young. Matthew Newcomen. William Sspurstow, who wrote a book against Episcopacy and the Common Prayer. (See Notarica.)
The handkerchief about the neck, Canonical cravat of Smec.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894