(inf) uses: prebitching, prebitch, prebitched. To complain about a device or service when the device is announced but long before it is actually released. Seen in the gadget world frequently when devices' functions are announced but a prototype or working model is still a year away.
Any announcement on a blog of a new device will be followed by a wave of commentary prebitching about said device. Common examples will start with, "I haven't held this product in my hands, but right off the bat..."
When the new Zune was announced all the apple fanbois came out to Engadget to prebitch the specs.
To complain about something long before it happens.
My wife started to prebitch before I even left to go to the bar.