Something with a kick?

My husband is attending a farewell potluck. The guest of honor has requested spicy food..he can take a lot of heat. I am trying to find a good recipe for buffalo wings..mainly for the sauce...or a very spicy dip that would go well with meat. This way, the folks who want hot can dip and the folks who don't will have something as well. Anything that works well in the crock pot is a plus as they will have limited options to re-heat anything. Thanks so much!