What is Cyanogenmod KANGs? I have read about compiling the most up-to-date source code as a "KANGs" but I can't find out anywhere what it refers to.
CyanogenMod developers coined the term "kang" originally. It goes back to the beginnings of Android development. It used to mean having one's development work taken, manipulated, rebranded, and re-released by someone else with no credit to the original developer.
Later this term morphed into having a less malicious meaning, and stands for the process of creating a code based of someone else's code or reapplying code that someone else created into your own code. A "KANG" therefore is a derivative work, based on the original with some modifications. It usually means an unauthorized version of a custom ROM.