Use the word claptrap when you're talking about overblown nonsense. You might read your English professor's new book and secretly feel that it's nothing but claptrap.
Writing that's grandiose or boastful is one kind of claptrap, and a ridiculous or absurd speech is another. Most claptrap involves ornate ways of talking or writing, involving rhetorical flourishes and a lack of deep meaning. The word comes from the idea of "a trick to 'catch' applause," and its meaning evolved to mean "showy, cheap talk" and also, to some degree, "nonsense."