How busy is busy?

Passing a phone box in Aldwych this evening, I saw a card advertising the services of a 'busy blonde student'. I think the writer probably meant busty. Unless, of course, the word 'busy' is supposed to have positive connotations for the target audience. The lady concerned is busy because she is much in demand, perhaps? My immediate reaction was that she'd be too busy to fit in any other than her regular customers. Or maybe busy with her studies, bless her. Exam season is coming up, after all.