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all my eye (and Betty Martin)
Nonsense talk. The origin of this phrase is disputed, but it may have originated with a sailor whose retelling of a beggar's (misheard) words was regarded as nonsense. Oh please, she's not rich. Any talk of wealth is all my eye and Betty Martin. If he says he's good at tennis, it's all my eye—he's terribly uncoordinated on the court.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
1. n. some fake drugs; a bad drug buy. John’s supplier slipped him some betty.
2. n. a good-looking girl or woman. (Usually Betty.) Who’s your new Betty, Bob?
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.