Definition of fanboy in English:

fanboy

noun

informal
  • A male fan, especially one who is obsessive about comics, music, movies, or science fiction.

verb

[with object]informal
  • (of a male fan) behave in an obsessive or overexcited way.

    ‘he fanboyed out meeting his idol on the red carpet’

Pronunciation

fanboy

/ˈfanbɔɪ/