The Collaborative International Dictionary of English v.0.48:

Hogwash \Hog"wash`\, n.
   1. Swill. --Arbuthnot.
      [1913 Webster]

   2. Meaningless talk; nonsense; balderdash; bunk; -- also used
      as an interjection, expressing scornful disbelief.
      [PJC]

WordNet (r) 3.0 (2006):

hogwash
    n 1: unacceptable behavior (especially ludicrously false
         statements) [syn: bunk, bunkum, buncombe, guff,
         rot, hogwash]

Moby Thesaurus II by Grady Ward, 1.0:

81 Moby Thesaurus words for "hogwash":
   balls, baloney, bilge, blague, blah, blah-blah, bones, bop, bosh,
   bull, bullshit, bunk, bunkum, chaff, claptrap, crap, culm,
   deadwood, dishwater, draff, dregs, dust, eyewash, filings, flam,
   flapdoodle, flimflam, gammon, garbage, gas, gash, guff, gup, hoke,
   hokum, hooey, horsefeathers, hot air, humbug, humbuggery, husks,
   jiggery-pokery, leavings, lees, malarkey, moonshine, offal,
   offscourings, orts, parings, piffle, poppycock, potsherds, rags,
   raspings, refuse, rot, scat, scourings, scrap iron, scraps, scum,
   shards, shavings, shit, slack, slag, slop, slops, stubble,
   sweepings, swill, tares, tommyrot, tripe, wastage, waste,
   waste matter, wastepaper, weeds, wind