Top definition
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
Get the mug
Get a spine slide mug for your fish Paul.