/ Dictionary / Index B best boy: Meaning and Definition of Find definitions for: best' boy' Pronunciation: [key] — Motion Picture and Television Slang. Motion Picture and Television Slang. the first assistant to the head electrician. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. best-ball match best-case Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language