A frozen piece of turd, preferably found on the grass on a cold Winter's morning, that has a stick poked into it to give the appearance of a tasty brown popsicle.
Lil' Timmy was walking around on the grass in his barefeet on a frozen wet morning when stepped right on a frozen turd. Then he stuck a tree branch in the frozen turd lengthwise to create a tasty dungcicle he intended to enjoy when he got back in the house.
The most serious level of dare one can threaten another with. Similar to a "triple-dog-dare," but at least 10x more serious. One simply cannot back done from a triple dungie dare, whether its life or death.
In Ireland, it is exceptionally more serious than a mere "dog" because we are referring to the infamous dolphin, "Fungie" which is quite often mistaken to be Dungie. In Irish folklore, Dungie is also thought to be the evil stepbrother to Fungie, and has sought to steal the Dolphin crown from Fungie in the Dingle Bay in Ireland.
Connor: I bet you won'tsmash that pie in my face.
Maeve: I bet you I will.
Connor: I triple dungie dare you.
Maeve: Wow. I can't believe you would bring Dungie into this.
*Maeve proceeds to smash pie into Connors face*