no real definition, can be used as a noun or adjective. dingus is similar to granola in the fact that it sounds exactly like what it is. a dingus is someone who will wear a cone on their head voluntarily, or just be a complete idiot or goofball
when i stepped into the weapon shop, i noticed that the penis armor they were selling was very dingus.
i saw a goofy group of kids who all played tuba, which means they all must have been dingi.
the kid who everybody makes fun of and will do anything we ask in order to try and fit in is a huge dingus.