To be "pottered" means to have been duped, lied to, deceived or simply douched by another person. Another definition of the word might pertain to the idea that if one is to do something that makes absolutely no sense at all, like for example putting a customer into a rental car when all they needed was their windshield wiper fluid filled up, then you would have been "pottered."
Ryan (rental car agent): "Hello sir, I'd be happy to put you into that vehicle, what are they doing to your car today?"
Customer: "Oh I just don't like the color, so I'll drive your car for one hour while they just stare at my car for awhile."
Brooke (rental car agent): "Hey Ryan, looks to me like you just got pottered!"