Bullshit is a common English expletive which may be shortened to the euphemism bull or the initialism B.S. It is mostly a slang term and a profanity which means "nonsense", especially as a rebuke in response to communication or actions viewed as deceptive, misleading, disingenuous, unfair or false. A person who excels at communicating nonsense on a given subject may be referred to as a "bullshit artist"