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1.
When you snowboard up to a rail, but don't jump high enough to get on it, causing you to fall backwards and slide down the rail on your back.
"Dude, did you see that? I just grinded that rail on my back!"

"A spine slide?? That's more impressive than a real grind!"
by CCotua January 22, 2009

Words related to spine slide

back grind pain rail snowboarding