Bloviation

Another word I quite like.

To discourse at length in a pompous or boastful manner.

Sociopath

I quite like this word and can see myself using it a lot henceforth. According to Wikipedia it is synonymous with psychopath, but has superseded it. Dictionary.com defines it as:

A person with an antisocial personality disorder, manifested in aggressive, perverted, criminal, or amoral behavior without empathy or remorse.

The American Merriam-Webster thing defines a sociopath as:

Someone whose social behaviour is extremely abnormal. Sociopaths are interested only in their personal needs and desires, without concern for the effects of their behaviour on others.