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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.
von Dimplestar 15. Dezember 2005
 
2.
what mrs humpty dumpty gives to mr dumpty
mrs humpty was o.t.r so she gave mr humpty egghead
von frankenpimp 10. Februar 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!
von 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."
von Iyad Tawjihi 25. Januar 2013
 
5.
some 1 with a large egg shaped head
adam oakes
von louise 13. April 2004
 
6.
a nickname for one who has an egg shaped head, usually immense in size, other names consist of egg nog, big head, and "wow"
Tripp is known as egg head because of the immense size of his head
von Cracka 19. Februar 2004
 
7.
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
von Hat boy 16. Januar 2014