Which of these words was originally created as part of an advertising campaign before being officially added to the Oxford English Dictionary?

In the world of advertising and brand development, companies often create new words (neologisms) to make their products memorable. These linguistic innovations can become part of our everyday vocabulary, demonstrating how commercial interests shape language evolution. This trivia question tests your knowledge about a famous advertising-created word that crossed over into common usage and eventually made it into official dictionaries.

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Hangry (combination of hungry + angry)
Selfie (photo taken of oneself)
Halitosis (medical term for bad breath)
Webinar (web + seminar)