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rude slang Someone who is apt to lie and embellish. Oh, you can't trust a word that bullshit artist says.
Also, bull artist. A person who habitually exaggerates, flatters, or talks nonsense. For example, Don't believe a word of it-he's a bullshit artist. Both versions are considered vulgar slang. The first dates from the 1940s, the second from the World War I period.
bullshit artistand bullshitter
n. a person expert at lies, deception, and hype. (see also bullshit. Usually objectionable.) What can you expect from a bullshit artist? The truth? Listen to me. Don’t ever try to bullshit a bullshitter!