Someone who is useful, but only from the neck down; i.e. not someone to use for tasks that may require the ability to think or reason.
"Hey, Mike, can you get me a couple of neckdowns for that installation?"
by Busby October 23, 2007
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A female that only looks good from the neck down. simliar the the term butterface
That hoe has a nasty ass face, but at least she's a neckdowner
by Stephen Costa September 28, 2006
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