A phrase referring to the tattoo commonly located on the lower back of females of the peasant underclass. Its origins can be traced back to areas of Essex although the trend has become widespread across the country. The tattoo can be spotted in the area between the jeans/thong and the shirt of the lady and is distinguishable by its resemblance to a diagram of a female's uterus and ovaries (although they feebly claim it is tribal art).
"She's got an Essex Spine…and therefore must have a caravan and a host of venereal diseases to match."
by Patrick Antonis August 16, 2006