1. A male assistant (especially to an executive) who performs various tasks
   "He worked as the CEO's boy Friday while completing his degree"

Type of: adult male, aid, assistant, bozo [N. Amer, informal], cat [N. Amer, informal], chappie [Brit, informal], geezer [Brit, informal], guy [informal], help, helper, hombre [N. Amer, informal], man, sod [informal], supporter