Sock worn over a male's genitalia that he then uses to give anal(to a male or female) this usually renders the sock covered in feces that is quite difficult to get out
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 poopsock."