The Collaborative International Dictionary of English v.0.48:

Teague \Teague\ (t[=e]g), n. [Cf. W. taeog, taeawg, taiawg,
   adj., rustic, rude, n., a vassal, villain, peasant, clown,
   Ir. thuatach rural, boorish.]
   An Irishman; -- a term used in contempt. --Johnson.
   [1913 Webster]