From WordNet (r) 2.1 (2005) (link)

  folderol
      n 1: nonsensical talk or writing [syn: folderol, rubbish,
           tripe, trumpery, trash, wish-wash, applesauce,
           codswallop]

From Merriam-Webster's Collegiate Dictionary, 11th Edition (2003) (link)

  folderol also falderal noun
   Etymology: fol-de-rol, a nonsense refrain in songs Date:
   circa 1820 1.  a useless ornament or accessory ; trifle
   2.  nonsense
  
  

From Oxford English Reference Dictionary (link)

folderol
var. of FALDERAL.

From English Explanatory Dictionary (link)

  folderol
  var. of FALDERAL.
  
  
  

From Webster's Revised Unabridged Dictionary (1913) (link)

  Folderol \Fol"de*rol`\, n.
     Nonsense. [Colloq.]

From Moby Thesaurus II by Grady Ward, 1.0 (link)

  170 Moby Thesaurus words for "folderol":
     a continental, a curse, a damn, a darn, a hoot, absurdity,
     amphigory, anacrusis, babble, babblement, bagatelle, balderdash,
     bass passage, bauble, bean, bibble-babble, bibelot, bit, blabber,
     blather, bombast, bourdon, brass farthing, bravery, bridge, burden,
     button, cadence, cent, chiffon, chorus, claptrap, clinquant, coda,
     curio, development, division, double-talk, drivel, drool,
     exposition, farce, farthing, feather, festoons, fiddle-faddle,
     fiddledeedee, fig, figure, finery, fleabite, flummery, foofaraw,
     fribble, frilliness, frilling, frills, frills and furbelows,
     frippery, froufrou, fudge, fuss, fustian, gabble, gaiety,
     galimatias, gammon, gaud, gaudery, gewgaw, gibber, gibberish,
     gibble-gabble, gilding, gilt, gimcrack, gingerbread, gobbledygook,
     hair, halfpenny, harmonic close, hill of beans, hocus-pocus,
     humbug, interlude, intermezzo, introductory phrase, jabber, jargon,
     jest, joke, kickshaw, knickknack, knickknackery, measure, minikin,
     mockery, molehill, movement, mumbo jumbo, musical phrase,
     musical sentence, narrishkeit, niaiserie, nonsense, ornament,
     pack of nonsense, palaver, part, passage, paste, peppercorn,
     period, phrase, picayune, pin, pinch of snuff, pinchbeck, pinprick,
     prate, prattle, rant, rap, red cent, refrain, resolution, response,
     rigamarole, rigmarole, ritornello, rodomontade, row of pins,
     rubbish, rush, section, shit, skimble-skamble, snap, sneeshing,
     sou, stanza, statement, strain, straw, stuff and nonsense,
     stultiloquence, superfluity, tailpiece, tinsel, toy, trappings,
     trash, trickery, trifle, trinket, triviality, trumpery, tuppence,
     tutti, tutti passage, twaddle, twattle, twiddle-twaddle, two cents,
     twopence, vaporing, variation, verse, waffling, whim-wham