The Collaborative International Dictionary of English v.0.48:

Claptrap \Clap"trap`\ (kl[a^]p"tr[a^]p`), n.
   1. A contrivance for clapping in theaters. [Obs.]
      [1913 Webster]

   2. A trick or device to gain applause, especially pretentious
      but empty rhetoric; humbug.
      [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Claptrap \Clap"trap`\, a.
   Contrived for the purpose of making a show, or gaining
   applause; deceptive; unreal.
   [1913 Webster]

WordNet (r) 3.0 (2006):

claptrap
    n 1: pompous or pretentious talk or writing [syn: bombast,
         fustian, rant, claptrap, blah]