What does it mean when a guy pokes you a lot?

I recently noticed a guy, and he seems to have noticed me too. We haven't talked much but he walked by me and poked my side. The next day he sat next to me at work and started talking to me more. I stood up and was waiting for everyone to walk in, he was behind me and kept poking my sides, it was cute but what's it mean? Also

I'm not chubby, I'm pretty tall and thin.
What does it mean when a guy pokes you a lot?
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