That special breed of zombie in Nazi Zombies that's 5 levels to early. They are capable of surviving multiple headshots, a nuke, a knife on insta kill, and can knock you down with one hit no matter what.
Joe: YEAH! LEVEL 30!
Bob: Did you a glitch or lapping?
Joe: Neither, I'm just that-
Bob: Super Zombie?
Joe: &@#$ %&( #@%^%$^!!!!!!!