blow smoke up (someone's) ass

blow smoke up (someone's) ass

rude slang To speak deceptively, usually in an attempt to hide one's true feelings or the way a situation truly is. I think they're blowing smoke up my ass about giving regular raises to their employees—I couldn't find any evidence to support that claim. Did my singing sound good? Come on, be honest—don't just blow smoke up my ass.
See also: ass, blow, smoke, up

blow smoke up someone's ass

AMERICAN, INFORMAL, RUDE
If someone blows smoke up someone's ass, they praise them in a way that is not sincere. Everybody tells you you're great when you're famous, but my mother refused to blow smoke up my ass.
See also: ass, blow, smoke, up