The person is Full of shit, or they talk much.
The speaker tonight was full of air, or Trump.
by OGDarkwolf February 25, 2017
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When someone is said to be “full of hot air,” it means that he or she talks a lot about topics he or she doesn't really understand or does not know.

He talks so much about nothing, He's just "full of hot air"
by NikkiFoster August 16, 2008
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