Four-flusher:
One who deceives or bluffs. The phrase comes from poker, in which a “four-flush” is a meaningless hand. (One needs five, not four, cards of the same suit in order to have a flush.)
You can’t believe a word that fool says—he’s a real four-flusher. [The Free Dictionary]
Heard on an episode of The Carol Burnett Show this morning. My Arts Editor was bewildered at the idiom.
