A kornblatt is a very specific type of person. A kornblatt is certainly bald-headed, very prone to anger, and, most importanly, a kornblatt will have no standards when coming to members of the opposite sex.
Originaly it stands for flake + korn. 2 damn well dota (=funmap in wc3) players. The roots of this word got bashed by a tiny factory called "nestle" who created breakfast-cerials called "cornflakes".