look up any word, like blumpkin:
 
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."
by Chumango February 08, 2010
 
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..."
by Male Nurse June 25, 2009
 
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!
by 00s4s00 November 15, 2009
 
4.
Dark room or basement where you lure unsuspecting and intoxicated women.
Come into my pain cave so I can bludgeon you.
by The Pantsman May 03, 2007