I think this song is about the power of intimacy with that one special person. The narrator feels awkward and shy but when she connects with her lover on that profound level she finds she was "a dancer all along." "Words can never make up for what you do" could pertain to the pleasure she receives on the surface level (that orgasm was beyond words), but the specific reference to "what you do" implies a more emotional climax on a deeper more personal level. Being shy with her emotions and feelings, she "can't possibly tell you how [she means]," and so she expresses her love through "dancing."
I think this song is about the power of intimacy with that one special person. The narrator feels awkward and shy but when she connects with her lover on that profound level she finds she was "a dancer all along." "Words can never make up for what you do" could pertain to the pleasure she receives on the surface level (that orgasm was beyond words), but the specific reference to "what you do" implies a more emotional climax on a deeper more personal level. Being shy with her emotions and feelings, she "can't possibly tell you how [she means]," and so she expresses her love through "dancing."