What does a guy mean by sending a video of himself dancing?

We've been friends for 8 months and yesterday he sent a video of himself dancing and said; a little dance for you. It was so funny and then I asked him; do you prefer being a dancer or an engineer? He said; dancer for you and engineer for work. Do guys mean something when they send a video of themselves dancing? Is that normal?
What does a guy mean by sending a video of himself dancing?
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