Controlled explosion nr. London's new US embassy

What do you think the speaker means by saying 'I mean'?

In what context do you think the phrase 'I mean' is often used?

How does the phrase 'I mean' contribute to the clarity of a statement?

Can you provide an example of a situation where 'I mean' would be an appropriate response?

What emotions or intentions might be conveyed when someone says 'I mean'?