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The state at which one is trying to stay awake but failing resulting in the slowly down-turning head and quick rise up when one realizes their falling which occurs over and over resulting in a motion that when sped up resembles the act of head-banging.
Introduced by a popular sports commercial in which the culprit was recorded on their phone falling asleep and then the video was sped up and put to slayer sounding music.

Whispers "Hey look at him"

"Haha, yeah, he's head-banging hardcore"
by Herolvl1 October 08, 2013
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