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Spag head or spaghead is derived from "spaghetti head."

One who has many thoughts or ideas, personal or work related, running through one's mind.
She was a real spag head. She had alot on her mind and seemed to need a way to organize her thoughts and ideas.
by jestrex May 07, 2009
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An annoyingly smart person.. a person who over-uses the spelling and grammar rules.
Fred: Hey, how's you?

Bob: Hi

Fred: Aint got no money today mate, sorry

Bob: I think you mean "I haven't got ANY money"

Fred: Wha?

Bob: Learn your spelling and grammar!

Fred: Shut it, spag head!!
by DizzyMoo March 20, 2008
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