A toilet humor version of saying owned. Used often in video games, sports, or just beating someone at something.
Jim: "Almost got the game winning kill! Camping in Quarry was such a good idea!"
*Javelin Noob spams a javelin missle and kills him. Game ends.
Jim: "WHAT THE FUCK JUST HAPPENED!!!!???"
Random noob: "OH YEAH BABY!!! Pooped On!!!!"