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1.
a snowboarding or skate trick. when you pop onto a box or rail, turning your body 90 degrees backwards, landing with your deck in a boardslide (perpendicular to the feature) facing uphill or backwards as you slide down the rail.
"yo, did you see that kid's frontside boardslide on that DFD rail, sickk..."

"i smashed my face slipping out on a frontside yesterday."
by t-fried-rice. March 05, 2009