Bombast

Bombast: Inflated language; the use of high-sounding language for a trivial subject.

Example: " 'Well' says Buck, 'a feud is this way. A man has a quarrel with another man, and kills him; then that other man's brother kills him; then the other brothers, on both sides, goes for one another; then the cousins chip in- and by-an-by everybody's killed off, and there ain't no more feud. But it's kind of slow, and takes a long time.'"
                  ( Huckleberry Finn, Pg. 109)

This is an example of bombast because Buck is trying to make the feud sound more important of what really is. He tries to make it sound like it's something which they couldn't live without. He is making it a lifestyle. When it really is not that important.