What does it mean by "blowing hot air" in this sentence?

I am a student learning English. While reading "Dear Abby", I came across this sentence. If, after that, you can find the strength to assert yourself, perhaps Derek will consider an attitude adjustment and stop blowing hot air. I guessed that blowing hot air meant to be upset. However, a... show more I am a student learning English.
While reading "Dear Abby", I came across this sentence.

If, after that, you can find the strength to assert yourself, perhaps Derek will consider an attitude adjustment and stop blowing hot air.

I guessed that blowing hot air meant to be upset.
However, a dictionary says something different.
Would you give some examples using that expression?
6 answers 6