A "bullshiner" is a cleaner version of "bullshitter". It waqs made mainstream by favourite Big Brother housemate, Mario Marconi.
The word is often part of the expression "Billy Bullshiner", There are many theories as to why Mario puts the word/Name "Billy" at the begging, one theory is that, because it's alliteration it makes it sound good and rolls of the tongue. Another is that the name "Billy" often crops up before other famous derogatory slurs, such as "Billy no Mates".
Liar; braggart. First use recorded amongst irate residents of 19th century Widnes as an unflattering nickname for infamous French farmer William De Theantandec, who toured North-Western agricultural shows displaying cows with artificially glossed fur.
"I've got 13 million fans but don't want to come across as the Big I Am"
"13 million? It's 14 million and you know it, you Billy Bullshiner"
a derogatory name given to someone who is an avid liar; it also implies that they have done something improper, usually sexually. Properly said with a slightly British accent. May also be used as an exclamation.
Girl 1: "I have something to tell you."
Girl 2: "What is that?"
Girl 1: "I slept with your brother."
Girl 2: "YOU BULLYWANKER!"