What does it mean when he said this?

So, one of my guy friends saw a picture of me with my new scrubs on today. We were meeting up for a quick bite to eat afterwards. He said, “you better not be wearing those scrubs.. I might have to do something”. What does he mean by that? I think he liked it because he sent me a video of him whistling after he saw that picture of me.
What does it mean when he said this?
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