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1.
The original name of the Former Ottoman Province of Yunanistan (present Greece).
Q: Where are you from?

A: I am from the Hellass.

Q: Where is that?!?!?

A: Its south of Macedonia, the land of Alexander the Great.
by volk2234 April 27, 2009
 
2.
The ass of hell, used in place of damnit.
"Oh hellass of shit!"
by zixiv June 03, 2005
 
3.
a word used only when a person is very upset or injured
hell ass!!!! i got my cock and balls caught in the rat trap again...
by i am william wallace September 03, 2003