An imaginary folder (or even a real one) where ideas, recipes, projects, and tasks are placed with the intention of getting around to them eventually, but often end up accumulating indefinitely.
Derived from the phrase "I'll do it when I get a round tuit" (a play on "get around to it").
My Round Tuit Folder is bursting at the seams! I really need to start tackling some of those projects I've been putting off.