Used in computer programming. When you're written some code that is not a proper solution, but will suffice for the time being, you put a TODO in the comment to come back to it.
Ben: Evan, I've written this crappy workaround method... it's terrible, but it prevents the application from crashing.
Evan: As long as the build for Monday is stable, I don't care. TODOify it, and fix it next week.