/ Dictionary / Index B big daddy: Meaning and Definition of Find definitions for: big' dad'dy Pronunciation: [key] — Informal. (often caps.)Informal. a man regarded as the paternalistic head of a family. the founder or a leading member of a company, organization, movement, etc.: the big daddy of soil conservation. the federal government: to thank big daddy for the tax cut. grandfather. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Big D big deal Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language