An individual who finds it impossible not to lie or fabricate a false story or experience at almost every opportunity they have to open their mouth. A person lacking something so substantial in their lives that they feel the compulsion to invent excitement and enrichment to fill their days in the form of total and utter bullshit
"Have you seen Billy Bullshit recently?"
"Yeah, yesterday, the wanker told me he just bought a top of the range lexus for £75k but it had a fault so it had to go back to the manufacturers."
"How did he afford that on a Call centre wage?"
"He didn't, it's total bollocks, the bullshitting cunt."