Come ON guys, haven't ya'll heard of DDB? Doggie Dinner Bowl looks? You know, when you've got a nice piece of meat in front of your dog and it looks at you with those wide eyes begging for it? That's what he's describing.
Other IOIs are questions from a girl when she's digging for information in order to establish rapport with you. This is why you should never introduce yourself because it's a self-obvious IOI. If she's intriguied/attracted to you, she'll ask. Now you've got to work on reeling her in deeper into your reality.
For those of us who weren't born naturals, it takes quite a bit of time to internalize the "Player habits" and processes. I've probably done ~500 bar/club sets which puts me at an intermediate level.
A lot of the basic skillsets I unconsciously do while previously I had to force myself to do things to improve body language, appearance and tonality. The more practice and field experience, the more congruent and socially intelligent you become. Hopefully at some point the advanced tactics will become part of my core identity and I won't even have to think twice about whipping it out and smacking some unsuspecting girl with it.
Given enough practice, everyone should be able to interalize the basic skillset and make it second nature. That's what is meant by "Being Yourself." You choose who you want to be and given enough time, incongruence between the loser that you currently are, and the winner that you want to be, will close. It's just that gap between image and identity will be obvious to everyone and more than just a little painful when people criticize you for not "Being Yourself."