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1.
A grueling physical workout intended to make you a better athlete. Usually done at home or the gym, and we call that place the "pain cave."
"If I want to get faster on the bike, I've gotta do my workout, so I am headed to the pain cave."
af Chumango 8. februar 2010
42 10
 
2.
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..."
af Male Nurse 25. juni 2009
14 18
 
3.
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!
af 00s4s00 15. november 2009
1 21
 
4.
Dark room or basement where you lure unsuspecting and intoxicated women.
Come into my pain cave so I can bludgeon you.
af The Pantsman 3. maj 2007
20 48