[aj]

Try assembly. It'll kick your ass real bad. Or better yet, try programming in binary!

On a more serious note, what do you mean by kickass? What features are you looking for in the language? What is your target usage/application? What is the environment you are going to be working in?

There is no straight answer to what programming language is most kickass. Different languages are suitable for different purposes and kick asses of other languages given the appropriate application development goal