A disease carried by a person/ginger with red hair. Once contracted it is not curable. Contracting this disease is as easy as kiss a ginger. If the person has dyed red hair they do not have the disease. This disease is highly spreadable and is genetic.
Girl:Omg i can't believe we kissed last night!
Girl:what is it?
Boy(ginger): welcome to the wonderful world of gingervitis.