When you're playing gamebattles for any shooter and you totally get smacked its called getting pooped on. (Ussually whilst playing mw2 for xbox 360)
DizziIy: "Pfft!! what a fuckingscrub! cross map one bursted him!."
Viison: "Yeah dude you wall banged him too rofl, race shut off!!"
Unison: "Pooped on!"
To do something so stupid, crazy and nonsensical, that normal people can't even understand what you were possibly thinking or how you could have done that.
Andy: Dude, I can't understand what you were thinking. Why would you set fire to your own porch?
Zach: Yeah, what was I thinking? I totally Pooped In the Shower on that one.
Meaning to get completely beat at a video game called halo 2 or to beat some one by 20 or more points also to use the battle rifle and take 3 shots and still kill the person that is shooting at you(it takes 4 shots to kill you)
You just got pooped-on bad kid. I just pooped-on you man.