What does it mean when a guy hits his leg against yours when sitting down next to you?

Because I like this guy and he talks to me and teases me a lot. So yesterday he sat next to me instead of his friend and his leg brushed against mine. And I put my foot against the support for a table and after a bit he put his foot right over mine and acted like nothing happened. So I put my leg against his and kinda move it up and down and he didn't move his leg so I know it wasn't mistake... And boys, if you tell a girl you like her costume but it makes her look like a prostitute, what does that mean? Thanks!
What does it mean when a guy hits his leg against yours when sitting down next to you?
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