Whopper/ˈwɑːpər/ Definition 1 of 3Pro Tip 1/3Exaggeration Clue Often signals exaggeration when describing size or extent; not always literal He had a whopper of an appetite. Pro Tip 2/3Emphasis on Size Used for emphasis to make something seem more impressive or significant. That movie was a whopper of a success! Pro Tip 3/3Colloquial Use Common in spoken English and informal writing; may seem out of place in formal text. She told me about the whopper of a project she's working on.