What does it mean when men stand with one leg straight and one leg bent, crossed over the straight leg?

I know of two men that will automatically do this stance when they talk to me or stand near me. I can't find an answer to this anywhere. Does it mean nervousness or that they are relaxed? Also he will put his hands in his pockets except his thumbs or put just his thumbs in his pockets while curling his fingers.

What does it mean when men stand with one leg straight and one leg bent, crossed over the straight leg?
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