Real Dictionary

larger than life
used for describing someone who seems more interesting or exciting than other people, for example because they are very talented, or because they behave in an unusual or interesting way. In American English, you can also describe them as bigger than life.
phrase: If you say that someone or something is larger than life, you mean that they appear or behave in a way that seems more exaggerated or important than usual.

larger-than-life in British English
greater, grander, etc. than most others of its kind
in an exaggerated form
adjective: exceedingly imposing, impressive, or memorable, esp. in appearance or forcefulness
adjective: exceptionally striking or colourful