Snakehead (1984)

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_http://www.barrypopik.com/article/890/snakehead_
(http://www.barrypopik.com/article/890/snakehead)
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"Snakehead" is not in Merriam-Webster at all??
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"Snakehead" (smuggler of illegal immigrants) is not in OED? Does it have a
new entry prepared?
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"Snakehead" (smuggler) is not in the Cassell Dictionary of  Slang?
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Will "snakehead" be in the HDAS?
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Does anyone have better than 1984?