Top definition
a disease in which somebody makes a sudden shift in music taste to any form of metal. they then become obsessed with metal for many years to come and end up worshipping some icon or symbol for a metal band. The largest prone to this disease are males between the ages of 13-19.
Example 1
Father Jim: "Hello son, i heard you got metalitus. Is this going to change your belief in the lord almighty?"

Example 2
Joe: "Hey you alright man? You've been acting a little strange ever since you got metalitus."
Will: "PRAIISEEE EDDIE!!!!!!!!"
by metal gawd February 15, 2010
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