Meanings
By shortening of the full expression blow smoke up someone's ass, deemed less vulgar.
How to pronounce "blow smoke":
AU
To speak with a lack of credibility, sense, purpose, or truth; to speak nonsense.
Example: "Are these "statistics" they cite verifiable, or are they just blowing smoke, trying to scare people?"
Example Sentences
1
Don't blow smoke, tell me the truth.