What does this mean?

Its kind of TRP dog whistle-ish, which is neither good nor bad.

Can you perform your joke or pickup line or whatever in an appealing manner with confidence and consistently without giggling or overreacting to your audience facial expression or generally looking anxious.

If you abstract out all the sex and the psychological rationalization behind it, its something like the audience would not find you flaky if you were presenting at a professional meeting. The presenter might be wrong or the audience might be completely uninterested, but they would describe it as presented well, by most common standards of presenting well. There's generally a side dish of smooth recovery from minor bumps in the road, which some people would consider a self evident part of the definition of "presenting well".

Originally, way back, the concept comes from the mix of the mental side of disciplined holding your frame of mind and the physical side of maintaining a strong frame when ballroom dancing or lifting.

I've witnessed women ignore a funny guy with a good personality or body for a boring "beta acting" guy with a highly attractive face.