Is it ever okay to touch a coworker back?

I have a guy friend whom I work with and we really get along well. We usually hug when we say bye to each other and he does copy things I do such as getting the same food I eat and I recently got a new water bottle and he did as well. Today he playfully bumped into me on the side of my body. He is very... show more I have a guy friend whom I work with and we really get along well. We usually hug when we say bye to each other and he does copy things I do such as getting the same food I eat and I recently got a new water bottle and he did as well. Today he playfully bumped into me on the side of my body. He is very friendly.

He is part of the managerial team like me but I would feel weird to touch someone I work with back. Is it ever appropriate to touch a coworker back in a certain context?
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