One who thinks with his spinal cord, in other words, a complete and total idiot lacking all signs of logical thought.
Jebus, Joe's such a vertebrain!
by P4lladium November 10, 2003
1 more definition
Vertebrae that generally "hold you in place" yet are now in painfull distress; causing ignorance, thus creating the Redneck illusion of the medical condition frequently referred to as "shrinking Vertebrains"
"My Vertebrains are shrinking," says the pain patient to the payday advance employee when needing a loan for more medication.
by Ksses2You May 25, 2011