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A home gym setup, generally used by cyclists, but also popular with other disciplines. It refers to a dedicated area, generally in a basement (hence, "cave") where long, grueling exercise sessions take place.
I did a triathlon in May, which meant lots of long days in the Pain Cave, since it was too cold to train outside.
Pain Cave by jdpatt January 18, 2019
A situation that involves either performing tasks for or working with people you do not like.
Question: "How was work today?"

Answer: "It was a total pain cave..."
Pain Cave by Male Nurse June 25, 2009
Dark room or basement where you lure unsuspecting and intoxicated women.
Come into my pain cave so I can bludgeon you.
pain cave by The Pantsman May 17, 2007
A mentally and/or physically debilitating condition worse than a hang over usually brought on by the consumption of copious amounts of alcohol combined with severe lack of sleep.
... oh my head... it's a day in the pain cave for me today, thanks to that goddamn moonshine!
pain cave by 00s4s00 November 15, 2009

pain cavern 

A recently discovered extension of the commonly known Pain Cave, which happens to be fucking agony. Fresh grinders come here to die.
You know you’re on your way to swollness when you’re deep in the depths of the pain cavern.
pain cavern by Lifeonthegrind February 3, 2018