(noun) meaningless talk to impress people
Man in Bar: How’s it going?
Girl in Bar: Not bad, and you?
Man in Bar: Good. Can I buy you a drink?
Girl in Bar: Sure.
Man in Bar: I’m very rich you know. I can buy you many drinks. Also I am very strong and can lift 150 kilos!
Girl in Bar: You are full of hot air!
When the professor told us how many books he had written, and how famous he was, we all thought he was full of hot air.
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