Someone whose stupidity has gone beyond that of the lowest rednecks. One does not have to be a redneck to be "Mentally Redneck", but just so stupid that rednecks look rather intelligent in comparison.
Jack has no idea of what he is doing, i swear he is mentally redneck, he is doing the complete opposite of what he needs to be doing, and is failing at even THAT.
by Sramazan August 28, 2015
Beyond stupid to the point that it has surpassed the stupidity of rednecks. A "Mentally Redneck" Doesn't have to be an actual Redneck, just someone so stupid they are now classified as "Mentally Redneck"
Atleast 75% of the people who voted for Deez Nuts in the North Carolina 2016 Presidential poll are mentally rednecks.
by Sramazan August 21, 2015