Is "Chicken Box" an appropriate term for a Yes/No dialogue with a warning?

We have a mixin so named, and since my project requires more of these types of dialogue boxes, I created a lot of tickets for myself with the term "Chicken Box" in the titles.

It's basically just a Yes/No dialogue with as ominous a warning as we can construct. The semantics are that the box gives the user a chance to chicken out on calling the callback action.

I've been assured that it's a common term, but I can't find any such usages via Google. Is this a proper term for this type of UI element? Is there a more common term?