In Britain at least, fit means beautiful, in the sense of highly sexually attractive. Obviously this results in endless conflicts between the more conventional meaning of "in good physical condition", although the newer meaning is clearly derived from that older. For example, one football SMS report read "Roy Keane is fit." which amused our childish sense of humour.
I'm unsure if this meaning exists in America or elsewhere, let me know.
stupot suggests another alternative meaning:
It also means ready... When you're going out... "Are you fit?" again... with the amusing joke... "No, I'm quite out of shape" Ha ha.
Useful indeed.