Noun. A lethal substance with a smexy hairdo and neat mustache. 1 small dose enough to kill 6.000.000 people. Only works with jews. But still 1/5 as lethal as Stalinium.
Jew: Hey i dont like nazis
Guy with bottle of hitlerium: *shows bottle with hitlerium* U wot m8 Jew (now scared): Oh shit hes got hitlerium
A logical fallacy (part of ad hominem), when someone dismiss speaker's argument and attacking speaker's personality by accusing the speaker(s) as a Nazi, racist, bigot, fascist, Hitler, or something similar