A generic and easy-to-find-a-place-for slur relating to someone who is generally an annoying waster, of little good to anyone. Usually, but not by definition, stupid as well. Think of it as a less-heard and slightly more insulting version of nobend.
People who go around urbandictionary.com giving everything a thumbs down definitely fit this category.

Someone so completely stupid if the world was about to end they'd try and buy a doughnut.

Made all the more damning by the use of the word fuck at the start