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To take a combination of Xanax and Ketamine recreationally, in reference to the Thai cave rescue of the 12 boys who were trapped in a cave by rising flood waters.
Dude you wanna cave out tonight? Totally! You can drag me around the apartment and I won't give a fuuuuck.

Cave myself out 

When you don't have to work or have any appointments or obligations and you don't want to leave your house or talk to anybody or do anything on your list of things you should do, as though you were hidden away in a cave.
Person 1: "Hey man, what are you doing tomorrow?"

Person 2: "Nothing dude, I just want to cave myself out."
Cave myself out by Gatablanca June 18, 2013

Let the brown bear out of the cave. 

The act of having a bowel movement. The idea being that the anus is synonymous with a dark cave, and the fecal matter being brown, is synonymous with a bear.
I will be in the bathroom for a while, I need to go let the brown bear out of the cave.

bats out of a cave 

i shouldn't have eaten that chilli, i just had to crap and it was like bats out of a cave.
bats out of a cave by flimbit January 28, 2010

knocking the bats out of the cave 

Sorry I didn't answer , I was knocking the bats out of the cave.