The little voice in the back of your head that warns when something could end poorly for you. Commonly confused with the conscience. A Nagging Self-Awareness is different from a conscience in the sense that, while a conscience generally stops one from doing something that could harm, or hinder everyone involved, a Nagging Self-Awareness tends only to speak up when it's owner in particular stands to lose something from the deal.
"Ol' Frank always did have a talent for ignoring his Nagging Self-Awareness."