A Canadian Ass-Ski is when you are on a Ski slope, find a random girl, push her down, pull down her pants and put your foot up her ass. You then proceed to put your other foot on her head and Ski down the slope. If she is still alive at the end of this, you proceed to take a hockey puck and shove it up her ass so she feels the spirit of Canada.
You: Had some fun last night.
Friend: What'd you do?
You: I hit the slopes with a Canadian Ass-Ski.
Friend: I dont believe you, let me smell your foot.
You: Here, smell my foot.
Friend: DAAAAAAMN, your right, it smells like your mom after her alabama hot pocket.