“Braggadocio (noun): Bumptious bragging or self-inflation; boastful language. Adj. braggadocian.
‘…the fancy lingoes of psychiatry, pedagogy, welfare, and big business—these are the twentieth century equivalents of ‘tall talk,’ sharing in the windiness of the nineteenth-century variety, but unlike it, incredibly dull and vapid. The hyperbole, grotesquery, and braggadocio survive only in American slang.’ Thomas Pyles, Words and Ways of American English“
Excerpted from: Grambs, David. The Random House Dictionary for Writers and Readers. New York: Random House, 1990.