Does it mean anything if a guy who I work was already sitting with his guy friend and I was about to sit behind and he asked me to sit next to him?

It was on break time I was planning on taking another table and then he turns around and asks me to sit next to him and kinda did the the arm wave thing does it mean Anything or he just being friendly?

Does it mean anything if a guy who I work was already sitting with his guy friend and I was about to sit behind and he asked me to sit next to him?
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