迷弟

mídì
(slang) fanboy

CEDICT

slang

Entry Composition

1 迷 mí
  1. to bewilder
  2. crazy about
  3. fan
  4. enthusiast
  5. lost
  6. confused
2 弟 dì
  1. younger brother
  2. junior male
  3. I (modest word in letter)