Agree and amplify is part of techniques that are sold by marketers of Game. The idea is that when a woman says something about you that might be considered disparaging, agree with it, and furthermore, amplify it. That is, go even further with it, just to show how ZFG (Zero Fucks Given, a future topic) you are.
In my personal case, I discovered agree and amplify by accident. Being a ruthlessly logical INT with a killer death stare was the jumping off point. People would point out some aspect of me that would normally be considered to be a detriment, but in my case, I considered to be a fine feature. I would run with the intended insult, and then drive the point further. It always helped that I was big and was clearly competent.
That is a key, one has to be competent to pull this off. By competent, one means that he has the mixture of confidence, daring, ZFG and ability to make it happen. The mixture varies per the fella and the context; but when people see it, they know it. A fella agreeing and amplifying on a matter where he has the wrong mix does not work. In fact, it makes him look silly. Perhaps this is one reason that this not easily mastered, as there is no easy way to go from unskilled to skilled in an evolutionary manner.
An example of agree and amplify in action is Donald Trump. Early in his candidacy he made some what are considered to be politically incorrect statements. The media jumped on them, with everybody expecting him to withdraw like a normal good Republican would under such circumstances. Instead of withdrawing, he amplified. People were amazed. His popularity increased dramatically. Everybody knows that political correctness is a bunch of BS, and here was somebody who would say it. Trump has the right mixture, furthermore his amplifications typically made sense, so it was off to the nomination for him.
If one can pull off agree and amplify as Trump has, then there is much respect to be gained. By going against the grain in a ZFG manner, people figure that here is a man who can do things. For many potential voters, that is enough.
Note also that all of this has raised Trump in the standing of many women, even though they might say publicly otherwise.