To light up a marijuana cigarette(joint) off to the side of a trail on a ski hill.
Skier stoner: (noticing his snowboarding friend stash a zip-loc bag full of marijuana in his winter jacket) Damn Son! We about to hit the slopes for the first time this year, we might as well spark that shit now to mark this special occasion.
Snowboarder stoner: HEEELL no bro! We enjoying this joint on the rocks!!