snake oil

any of various liquid concoctions of questionable medical value sold as an all-purpose curative, especially by traveling hucksters.
Slang. deceptive talk or actions; hooey; bunkum: The governor promised to lower taxes, but it was the same old snake oil.

1925–30, Americanism

snake-oil, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
He had snake oil to sell us, something that would make everything better by
  restoring our moral vitality.
He's selling snake oil to the eager customers, and he knows it.
The culprit is public ignorance of science which uncritically allows in the
  purveyors of snake oil and scare stories.
In any case, some of the financial snake oil peddled at the height of the
  housing bubble was bad for saving.
Idioms & Phrases
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