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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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. a cheater. Bruno is a lousy four-flusher, among other unpleasant things.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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.
Endangered Phrases by Steven D. Price Copyright © 2011 by Steven D. Price