Poison Ivy, What is the fastest way to get rid of it?

To make a long story short I got poison ivy on my butt, after a stupid decision. Really not a big deal, but having the top of my butt itch insanely during finals is not what I consider a good time. So if you have any remedies that are proven fast ways of getting rid of this itch, I am all ears. And yes laugh away the situation is hilarious.