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Bullshit (often bowdlerized to BS), also Bullcrap, is a common English expletive. It can also be shortened to just "Bull".
Most commonly, it describes incorrect, misleading, false language and statements. Literally, it describes the feces of a bull. As with many expletives, it can be used as an interjection (or in many other parts of speech) and can carry a wide variety of meanings.
Bullshitting is usually when one makes statements that are false, or made-up. Usually people describe other people's action of making a lot of statements as bullshitting in arguments, when one is making up rules or making examples that are not anything to do with what they are discussing or when one is making statements by using examples that need different rules to be applied, so this person is bullshitting
As it contains the word "shit", the term is sometimes considered foul language, hence the use of the euphemistic abbreviations "bull" and "BS". Nonetheless, the term is prevalent in American English and, as with many words, the term is used in a variety of countries, some dating back to approximately the same era World War I. In British English, bollocks is a comparable expletive, although bullshit is now a commonly used expletive in British English also.