That diet pill is just snake oil.
snake oil
idiomA fraudulent, ineffective potion or nostrum; panacea.
The salesman promised his miracle cure would fix everything, but doctors warned it was pure snake oil.
In an age of misinformation, unproven supplements marketed as panaceas proliferate online, modern iterations of the snake oil peddled by nineteenth-century hucksters.
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add oil
Synonym of let's go: a cheer of encouragement, support, etc.
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burn the midnight oil
To work studiously, especially late into the night.
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come up with snake eyes
To fail to come up with anything; to get nowhere.
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drain the snake
To urinate.
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go snake
To act in an erratic or unrestrained manner.
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oil and water
Two things which are incapable of mixing or coexisting harmoniously with each other.
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oil burner
A device whose operation causes apparent combustion of lubricating oil.
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oil trash
An uncultured, rowdy roughneck employed in the petroleum industry, especially a "white trash" person if used negatively.