snow job
snow job {n.}, {slang}, {informal}
1. Insincere or exaggerated talk designed to gain the favors of someone.
Joe gave Sue a snow job and she believed every word of it.
2. The skillful display of technical vocabulary and prestige terminology in order to pass oneself off as an expert in a specialized field without really being a knowledgeable worker in that area.
That talk by Nielsen on pharmaceuticals sounded very impressive, but I will not hire him because it was essentially a snow job.
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Source: A Dictionary of American Idioms