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You probably don't want to know the handshake.... You just spit on your hand before you shake.... lol...

I think you are pulling my leg. I know some redneck people I'm gonna ask.

Well, yes and no. It used to be a custom, when making a deal you would "spit on it" and shake. Most people don't do that anymore, but I have seen it done. It's rather nasty to me. I would say that @janton has seen it before.
I've seen deals worth thousands of dollars sealed with nothing more than a handshake, no contracts to sign, people just giving their word and following through with it.