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2.
A disease suffered by Nebraska football, basketball and baseball fans that causes them to become arrogant, insufferable tools in all forms of written, verbal and non-verbal communication.

It often leads to delusions of grandeur and pathetic statements comparing Nebraska athletics to things that are actually important.
"That guy just punched a nun for not wearing red!"

"He's got red fever."
by ProfessorX May 29, 2006
 
1.
A strong physical attraction to people with red hair.
When I first saw her, I couldn't resist Lindsay Lohan, 'cause of my red fever.
by LA the DJ November 03, 2008