Definition from Wiktionary, the free dictionary
- A decorative cake distributed among friends or visitors on Epiphany. In many traditions it contains a pea, a trinket or some other small object which entitles its finder to be the "king" for one day.
Among the various names for a special cake eaten on Epiphany this appears to be by far the most popular, at least according to Google search.
cake eaten on Epiphany