This meaning here depends on your personal circumstances. If the restaurant was, by your standards, very posh and/or ostentatious, it is a warning that temporary reverses or a sudden extra demand on your resources will entail a need to economize. If the restaurant was of the type you would normally patronize, it signifies pleasant social activities connected with business. But if the restaurant was in the cheap, greasy-spoon category, you can expect an increase in your income soon.