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.

A fraud, a bluffer. To hold a four flush in poker is to have four cards of the same suit but not the fifth card that would make a potentially winning hand. Since four of a suit is worthless, a “four-flusher” is gambling that you'll believe her or she has the goods or the right stuff. The suggestion that a four-flusher is so full of crap that getting all of it down the toilet will take four pulls of the handle is an imaginative but incorrect derivation of the phrase.