egoitis

From ego +‎ -itis.

egoitis (uncountable)

1. (humorous) A notional disease characterised by an overblown ego.
   • 1906, William Magnay, The Master Spirit:

     "Ah, she has caught the disease egoitis in a virulent form from her husband who was once a commercial traveller," Gastineau commented.

   • 1965, Edward John Kempf, Abraham Lincoln's philosophy of common sense, volume 1, page 166:

     ...a compensatory egoitis that grew sarcastic and satirical in debate.