An utter and complete fool; someone who is so naive and devoid of wisdom and intelligent thought, a more offensive and more difficult word is too good for them. Thus, they are described as a dingus.
SOMEONE WHO IS FREAKING DUMB!!! ALSO THEY ARE THE WORST EVER!!! SOMEONE WHO IS A DINGUS IS THE SCUM OF THE EARTH AND THEY HAVE ZERO REDEEMING QUALITIES!!! AND NO ONE LIKES THEM!!! AND THEY ARE GOING TO DIE ALONE!!!!!