2. A rock you carry with you to the restroom, it can be the same rock or a new rock dropped off each time
3. The rock that people often use to hide a key in front of their house, that very conspicuously looks more like a rock made of poop than a real rock
1. Man, I need to change my diet, I've been pooping rocks for weeks!
2a. Hey, can you pass me my poop rock? I need to make a pitstop.
2b. We are running low on poop rocks.
2c. If you are gonna be in there awhile don't forget*the* poop rock!
3 - To get into the house just grab the key under the poop rock out front when you get there.
The "Number 2" version of a Pee Bottle. A sock which is often used by World of Warcraft players during long raid nights as a place to poop into when leaving to use the toilet is not feasible.
Younger players will often hide these poop socks under their beds rather than disposing of them properly, to the surprise and disdain of their mothers.
"Hold on a sec, team. I have to poop."
"You can't leave, we're in the middle of the boss fight. You got to use your poop sock."