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1.
1. A person who is considered intellectually gifted in the field of academics. "Egghead" is usually used as college-speak to describe a brainiac.

2. A person's whose head is shaped like an egg.

Most people however, will use this word interchangeably as a pun. It has also been known that people whose heads are shaped like an egg are usually large at the top, which explains the larger brain-size.
Jackie will probably do well in that PhD program. She has always been known to be a bit of an egghead from elementary school all the way through college.
av Dimplestar 15 december 2005
 
2.
what mrs humpty dumpty gives to mr dumpty
mrs humpty was o.t.r so she gave mr humpty egghead
av frankenpimp 10 februari 2004
 
3.
An overly intellectual person; someone who thinks too much.
Charles can't order lunch without using an algebraic formula -- what an egg head!
av anonymous 100 20 juni 2006
 
4.
a very intelligent person.
"Ihab didn't make very good grades in school, but his sister, Reham, was a real egghead."
av Iyad Tawjihi 25 januari 2013
 
5.
A person who is believed to have an IQ of a rock on this Earth. Meaning they are stupid.
Rick: Yo James

James: *awkwardly stares at Rick*

Rick: Uh, hello James are you gonna respond?

James: *Still is on complete silence*

Rick: Oh that's right, James is an Egg head. Oops
av Hat boy 16 januari 2014
 
6.
some 1 with a large egg shaped head
adam oakes
av louise 13 april 2004
 
7.
A self centered person, who believes that they are never in the wrong and that they are the center of the universe.
They also have terrible hair and a bad choice in crushes.
Dude, stop being such an egg head!! You might aswell dye your hair blue!!
av Geoff Steiner 30 juni 2008