More properly, "Metric Fucktonne." The Fuckton is the Imperial standard for the measurement of fuckweight, while the Fucktonne, in contrast, constitutes the Metric measure of fuckmass.

Generally used to imply superlative quantity with the Metric standard included to emphasise this point. The inclusion of the term is, however, fundamentally a misuse of that standard, as the Imperial Fuckton (2000 Imperial Fuckpounds) denotes a slightly greater measure of fuckweight within Earth's gravitational pull than does the Metric Fuckton (1000 Metric Fuckilograms).
I've got a Metric Fucktonne of this stuff to finish before Monday, or I'm fucked indeed.
by Yst December 12, 2004
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A unit of measure that is roughly equivalent to 25 shitloads.
"You should see Bill's firearm collection. He has a metric fuckton of guns!"
by C-Money666 January 15, 2020
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equivalent to one million fuck tons (a fuck ton is approximately 200 shit-tons)

An extremely large quantity.
"I have a mega-fuckton of organic chemistry homework due tomorrow."
by Mimi Baker February 21, 2013
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Roughly 1200 Metric Fucktons. A unit of measurement in the extreme supurlative.
MY CETA is a star that has roughly 2 Imperial Fucktons of plasma.
by MatthewTay October 24, 2007
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A unit of weight that is so uncomprehendingly huge that if you even tried to comprehend it you would instantly die.

the metric (and therefore larger) version of a fuckton.
Bob: hey Joe how much do you weigh?
Joe: like a metric fuckton.
Bob: *dies*
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