To play in snow piles.
After, a hole is dug in one of these piles and the snowpilers talk about deep things in the dark.
Often happens in a field and requires 2 or more friends.
There were ideal snowpiling conditions outside so Pocahontas rounded up some taller friends and off they went.
The act of parking your car behind one of those parking lot snowpiles in order to hide your indiscretions.
Kelly and Tom decided to go snowpiling so that his girlfriend wouldn't see his car.