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1.
An area of your back that cannot be referred to by using specific terms such as muscle, tendon or vertebrae.

Coined by Mike Tyson.
"I broke my back... my back is broken" "Spinal."
by JCS Bricks December 12, 2005
 
2.
the act of fucking a chick so hard analy her spine pops/(breaks
for those pros out there)
some guy offered free blowjobs but i offered spinal instead
by andy burchfield October 02, 2008