Top Definition
A metallic material which, as its name suggests, is really fucking hard. It is the second strongest substance known to exist in the Universe, after Invincibilium.
A: Damn, this stuff is really fucking hard, what is it made of?!?
B: Reallyfuckinghardium
A: Oh...
by Zea1ot July 03, 2010
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.