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1.
Means 'fucking mental'.
Has nothing to do with fermentation, fermenting or anything of the like.
fucking+mental=fermental
Woah, that movie was completely fermental!
by frothycoffee June 14, 2011
 
2.
A state of mental illness where a post menopausal woman describes herself on an adult site as "juicy" when the photographic evidence is clear shes fermenting from multiple yeast infections... and mucus build up...
Dude, that old chick has to be fermental her pussy looks like a plate of bad clams on an old beef pancake....
by Bill the Random December 20, 2010