Definition

A gloriously creative insult combining 'cretin' and 'sack' to describe someone so spectacularly stupid that one word simply won't suffice. Reserved for those who have truly earned maximum verbal contempt.

Example Usage

Did you really just try to plug your phone into the USB port upside down? What a cretsack.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=CretSack&defid=12246414)