A mildly insulting/endearing term for someone who is slow on the uptake or just a bit dim.

A person who is not only lacking in clue but is apparently unable or unwilling to acquire clue even when handed it on a plate in generous portions.

A very foolish person; idiot; imbecile; cockwomble; muppet; douche bag; somebody who makes outrageously idiotic statements while convinced that they are absolutely correct; somebody who doesn't understand basic English, or other appropriate language, or grasp fundamental concepts; somebody who is incapable of reason or logic; someone who acts in an egregious fashion.

A person so lacking in intelligence that they cannot grasp the simplest concepts.

1. A term used to describe one who is acting like a fuckwit - partaking in activities which are foolish and / or irritating to others.

2. Sometimes used as a semi-endearing term, to describe a friend's ridiculous but amusing capers.

Someone who thinks they're knowledgable in urban slang and contributes hundreds of shitty, worthless entries to urbandictionary.com.

Someone who wastes time perusing pointless sites like Urban Dictionary rather than doing something productive. Applies particularly to those who submit definitions.