(adj.) Describing the state of someone's work computer after co-workers prank it if it's left unlocked. Often the desktop wallpaper, Windows event sounds, IM away messages, email signatures, etc. are changed to a My Little Pony theme.
"Aw man, I left my computer unlocked and it now it's ponied. Now I gotta spend 30 minutes getting it back the way it was."
owned but worse. originated when I made it up while talking with friends in early 2004 while discussing the hilarity of people typing pwned instead of owned. i made the jump and pronounced it with a "p" and it evolved into ponied. which was fitting since we know a guy that goes by pony, and he thinks he owns everyone. again, i want to reinstate that i made this up, not this other n00b prof. walrus.