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
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