The Collaborative International Dictionary of English v.0.48:

Tosh \Tosh\, a. [Cf. OF. tonce shorn, clipped, and E. tonsure.]
   Neat; trim. [Scot.] --Jomieson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

tosh
    n 1: pretentious or silly talk or writing [syn: baloney,
         boloney, bilgewater, bosh, drool, humbug,
         taradiddle, tarradiddle, tommyrot, tosh, twaddle]