blow smoke

• blow smoke up someone's ass

By shortening of the full expression blow smoke up someone's ass, deemed less vulgar.

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blow smoke (third-person singular simple present blows smoke, present participle blowing smoke, simple past blew smoke, past participle blown smoke)

1. (idiomatic) To speak with a lack of credibility, sense, purpose, or truth; to speak nonsense.

   Are these "statistics" they cite verifiable, or are they just blowing smoke, trying to scare people?

• See Thesaurus:nonsense
• See Thesaurus:deceive

• smoke and mirrors
• smoke blower
• Tobacco smoke enema