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2.
A male or female that looks good as hell from the neck down...a.k.a. butter face (everything looks good but her face)
He/she has a nice body, but an ugly face.
That guy has the coldest neck-down!
 
1.
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
 
3.
Using somebody for their physcial skills and having no need for them to think or talk.
Listen, you're just a neck down, i don't need you to think, just do the work!
by THE REAL ELVIS November 22, 2011