Official definitions for nerd, geek, and dork…and other human descriptors:
Each of the three above words use the words "inept" and "foolish."
Nerds have the added distinction of being "unattractive." Ouch.
Nerds are people of above-average intelligence who place little importance on their appearance. Nerds are often aware of their status, but they don't mind. In fact, many take pride in the putdown, as it means they're smart and not wrapped up in superficial worries.
Geek is a more specific term. Originally, say back in the day when imbecile, moron, and idiot were medical terms, "geek" referred to carnival performers whose act consisted of biting the heads off chickens and eating glass. Over time it came to be applied to anyone who got paid to do work considered odd or bizarre by mainstream society.
Today, the word ‘geek’ has a different connotation. Like nerds, geeks are smart, but they tend to focus more on technology. As Urban Dictionary explains, these are the people you make fun of in high school and later work for as an adult.
Being called a "dork" is the biggest insult of the three. There's no way you can spin it into something positive. After all, everyone knows ‘dorks’ are "stupid" but they don’t get it…dorks assume they're cool. Oh, and they smell, too, because they tend to not bathe or brush as often as they should.
Each could use a dose of ‘Valley Girl’ and all of them would benefit from assimilating a little ‘Greaser.’
So, to sum things up, the only way to be cool and successful is to be a little of all of the above. You see, all God’s chillun’ gets to sing in da choir.
Then you have ‘shithead,’ which is a narrow-minded or ignorant waste of food, water, and air. Modern day shitheads are usually shitheads for life – can’t teach ‘em nothing and they never learn how not to be a shithead. In the olden days, when man first started living in villages and towns that had houses with more than one story, the chamberpots would, somewhat uncouthly, be emptied out the windows onto the streets below. If you were unlucky and got nailed with some of the solid geometry you were called a "shithead."
The ultimate human descriptor all of us seem to know, and aptly used in great abundance, is ‘asshole.’
An Asshole is the worst kind of person, a disgusting, loathsome, vile, distasteful, wrathful, belligerent, agoraphobic mess of human fecal matter. They are the lowest of the low. They transcend all forms of immorality. To be called an asshole is to have your very soul ripped apart and shat on. It is the very worst of insults. The word "asshole" may be the worst cussword of the English language, almost as bad as cunt. I enjoy the feminists who talk with costumed envy about dicks and penises all day but wince when they hear the word, ‘cunt.’ Oh Boohoo. Life's a bitch with puppies.