When the creators of a series (television/book/manga/etc ...) choose to end it in the most shocking, unrealistic, cliche, or random way possible. Usually the result of the writers' lack of foresight or ingenuity. It can be described as a "Deus Ex Machina" which, instead of arbitrarily moving the plot forward, ends the series entirely.

The phrase is derived from the "Stone Ocean" story arc of the Jojo's Bizarre Adventure manga, where the antagonist literally destroys the universe. A similar universe is created, but no one there remembers anything about the previous universe and history changes dramatically.

While technically the manga's still called "JoJo's Bizarre Adventure", the story's only remotely similar to the prior. Most fans were either traumatized or pissed-off. The manga's writer is believed by fans to have ended the previous plot line to remove it's creative constraints to do something different.
Person 1: "Did you see the finale of that old TV show 'Dinosaurs'"?

Person 2: "Yeah. What a stone ocean that was, 'eh?"
by ThePenguin227 December 6, 2016
Get the stone ocean mug.