Top Definition
Currently the largest amount of any given thing. Many times larger than the fuckton, and vastly larger than a shitload or assload.

1 Gigafuckton is equal to...

1x10^3 Megafucktons
1x10^6 Kilofucktons
1x10^9 Fucktons
After not emptying the trash for 3 weeks, I found a gigafuckton of ants living in it.
by cchriss92 September 20, 2009
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