I definitely heard the phrase before the show came out.
No you absolutely did not, unless you were talking to dorks who started using out-of-context nonsensical phrases from their favorite fantasy book. If you think you heard the term not as a reference to ASOIAF you are misremembering. Its origins do not go back to the 1800s. The term in this context refers to a child who has lived their entire life in the years-long summers of the world of ASOIAF. That is what it means.
No you absolutely did not, unless you were talking to dorks who started using out-of-context nonsensical phrases from their favorite fantasy book. If you think you heard the term not as a reference to ASOIAF you are misremembering. Its origins do not go back to the 1800s. The term in this context refers to a child who has lived their entire life in the years-long summers of the world of ASOIAF. That is what it means.