Touching my shoulders and patting my back?

Anonymous
I was standing at the computer at work today and my coworker walks by and touches both of my shoulders at the same time and then pats my back.

Then he used my mic (that's clipped on my shirt pocket) to tell the manager something and then he clipped it back on.

Usually, he's nice, but he's always giving me grief about things at work. And up in my business when I'm working on something. Like in a nosey kind of way. He's at least 7-10 years older than me.

What does it mean when guys touch your shoulders and pat you on the back? It kinda caught me off guard..
Touching my shoulders and patting my back?
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