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
4 Words related to Reallyfuckinghardium

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