Said affectionately to a person one knows and admires, as praise for who they are and the things they do. It's used more as ongoing praise, rather than for one specific amazing accomplishment.
You're applying to teach French and Farsi on the side, while trying to start a company, and helping host an international arts fair, and creating sophisticated oil paintings, and sewing your own clothes, all on your own? Wow, you're a wonder!
by DuStat October 18, 2011