double dog dares

After a dare has been made and the daree has refused, the darer can then raise the stakes by double dog daring the daree, meaning that if the dare is carried out by the daree then the darer will also perform the task.

Triple dog dare is when a third person wants in on the dare. And so on.
> I double dog dare you to moon that cop. If you do it, then i will do it.