Meaning of the word "blow smoke up someone's ass" in English

What does "blow smoke up someone's ass" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

blow smoke up someone's ass

US /bloʊ smoʊk ʌp ˈsʌm.wʌnz æs/
UK /bləʊ sməʊk ʌp ˈsʌm.wʌnz ɑːs/
"blow smoke up someone's ass" picture

Idiom

to flatter someone excessively, often insincerely, in order to gain favor or manipulate them

Example:
He's always blowing smoke up his boss's ass to get a promotion.
Don't blow smoke up my ass; just tell me the truth.