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1.
A unit of measuring how much some one got fucked over
Wow did you see that, he got totally Giga-Fucked
by Glenjamin87 August 09, 2009
 
2.
The ultimate/strongest form of something
I beat the boss, and then he turned into the gigafuck boss and destroyed me.
by Zack_Sawyer1993 October 23, 2014