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like, when you're taking a shit and after you wipe and flush your turd is dragged along the bottom of the bowl,leaving marks and sometimes primitive drawings.this is sometimes,but not always,discovered by the next user.also called extra credit.
ex.1"dude,you just left nasty ass cave painting all over my toilet!thats the last time you use my toilet,motherfucker."

ex.2"whoa,that was a bad turd.greasy but tight.*looks in the bowl*EWWW!!fuckin gross.
by the shit afficianado January 28, 2007
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When a man engages in sexual intercourse with a girl without any form of protection. The man fails to 'pull out' in time, therefore leaving the female with 'cave paintings' inside of her nether regions.
"We didn't have any condoms but we still done it anyway. I didn't pull out in time and she was left with some cave paintings."
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The beautiful designs and markings left on the inside of the toilet bowl after taking an extra-firm dump.
The firmness of the turd creates a "crayon effect".
Cave paintings will not wash away with flushing leaving but will deteriorate over time, leaving them for your friends and family to enjoy for days or weeks.
Wooo! That fudge dragon I pushed out of me left some cave paintings that looks like Charlie Sheen. Enjoy!
by Ape Creature June 16, 2011
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a cave painting is when you are doing a girl doggy stle while she is on her period. And you pull out and draw something on her butt cheek with the blood.
I pulled out and drew a little buffalo on her ass.
by william carr April 29, 2005
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An act of love that involves inserting the hand in the anal or vaginal cavity and writing your name or a pictorial on the inside wall with your fingers.
She was soaking wet and screaming for more, when she asked me to do a cave painting in her punany. I happily obliged!

He wanted to remember me forever so I cave painted my initials in his ass.
by teddybeest October 28, 2010
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the markings left behind from a beastly turd after flushing it.
"LOL! you should have saw the cave paintings left behind that that beast drew on the way down the poop shoot!"
by SkeksiesAKArissa September 29, 2011
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