Assbag, asshat, assclown, ****tard, ****stick, and ****chop.
I was introduced to those words several years ago and have continued to use them to this day. The most expressive cusswords are compound words...for instance, a kid that I teach that is almost 16, in a class full of 13 and 14 year olds taught me the other day that I was a stupidass. I'm sure the word worked for his purposes.