One of the mysteries of the English language finally explained.
1The action or an act of nodding one's head to express assent, greeting, etc.
2The action of repeatedly, and often violently, nodding or shaking the head, as a form of headbanging; an instance of this.
Mid 19th century; earliest use found in London Journal. From head + nodding.
head nodding/ˈhɛd ˌnɒdɪŋ/
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