To do what one said one could do, or would do, not just making empty promises. To do things consistent with what one claims. This phrase indicates that failing to match behavior with talk results in loss of credibility and trust.

What is the meaning of walked the talk?

It means putting your words into action—showing that you mean what you say by actively doing it yourself. It is a version of the everyday phrase 'practise what you preach'.

Which is correct walk the walk or walk the talk?

: to do the things that one says one will do As the saying goes, "Don't talk the talk unless you can walk the walk!"