Which of these linguistic terms was first popularized through an advertising campaign and later became standard terminology in language studies?

Throughout history, language has been shaped by advertising and marketing. Some linguistic innovations have become so embedded in our culture that we've forgotten they originated in ad campaigns. This poll tests your knowledge of how language and advertising have intersected, creating new words and expressions that expanded our lexicon. Can you identify which famous linguistic term was coined through a groundbreaking advertising campaign?

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Portmanteau (a word blending sounds and meanings of two others, like 'brunch' from breakfast and lunch)
Earworm (a catchy song or piece of music that continually repeats through a person's mind)
Neologism (a newly coined word or expression)
Onomatopoeia (words that phonetically imitate the sounds they describe)