Full of air

The person is Full of shit, or they talk much.

The speaker tonight was full of air, or Trump.

by OGDarkwolf February 25, 2017

full of hot air

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 October 9, 2008