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An unholy downpour that inundates everything with fantastic amounts of liquid. Alternatively, something that moves with such force and in such great quantity that it cannot be diverted, avoided, or stopped.
The torrential rain caused massive flooding.

When questioned about her hoe-riffic behavior, her "explanation" was an exquisitely horrid torrential outburst of profanity.
by Tongue-In-Cheek September 01, 2012
Out of control, a frenetic state of being.
The party last saturday was so torrential!!
by Gina Capppello December 13, 2006