To have the wrong part/item ordered for you to install at a client, thus making YOU look stupid.
Me: I got to the client to install some RAM only to find I'd been Parker'ed. It was laptop RAM and I needed Desktop RAM! I was SO embarassed and had to come back later after getting the RIGHT part ordered. The worst part is the original is non-refundable!
Co-Worker: Yeah, man, you got TOTALLY Parker'ed!