I steal this phrase from a comment on Meta Stack Overflow:
yep, I think I've broken my duck or so to speak :) – Kev♦ 51 mins ago
The context is one of having been basically broken into a particular fold, or going through a rite of passage - Kev has symbolically become a true moderator because he has gotten a Meta thread about his actions.
But the phrase is... unusual, to be soft about it. You don't break open ducks, or really most animals at all you don't break. Is this a common idiom? If so, what in hejudas inspired such a phrasing?