There's an extra bit of slide to the shake. We're not jive-ass- turkeys in some long lost Harlem yesteryear. No one says slap me some skin anymore. We're all about fancy handshakes and firm handshakes. Fist bumps. That slide speaks volumes.
How many people do you know who shake hands and then immediately shove the shaken hand into a pocket? That's what I'm talking about. You need to look for the things that are off. The things other humans don't do. That is, if you want to see what really happens on the streetcorners in your neighborhood.
If you've never done it, maybe you don't look for it - that sliding shake. But don't go thinking you're too slick. Don't think you're fooling everyone. You may fool most people, but there are a bunch of us who know exactly what you're doing.
We just don't care.