Neither do I. Unless they mean Akatosh's statue and him being the god of time.(At least, I thought he was)
In which case... I still don't get it.
Lol. A dragon break is when linear time gets fractured and.. things unexplainable in limited mortal words happen.
Several different times existing next to each other, people giving birth to their own fathers, general chaos.
The last time this happened in the elder scrolls was at the end of Daggerfall. The dragon broke and after it was mended, the warp in the west had happened. All possible endings to Daggerfall actually all happened, at the same time.
So the joke explaining how M'aiq ends up in Skyrim uses this 'dragon break' , and that there are dragons in Skyrim, and that breaking an actual dragon, not the metaphor, is silly.
http://www.uesp.net/wiki/Morrowind:Where_Were_You_..._Dragon_Broke
http://www.uesp.net/wiki/Oblivion:The_Warp_in_the_West
http://www.uesp.net/wiki/Oblivion:The_Dragon_Break