There’s no single particular definition that is capable of describing EXACTLY what or who a dingit is. Dingit can be used in a loving tone meant with a full heart. It can also be used as an insult when common sense is lacking within an individual. The word ‘dingit’ takes on many forms, it is a highly versatile word enveloping multiple different definitions based upon how one chooses to utilize it in a sentence. One could say the word ‘dingit’ is multifaceted.
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.