"Clipping" is the process of turning your vehicle into a Frankenstein monster. It entails cutting the vehicle horizontally through the specially engineered passenger compartment, throwing away the damaged front or rear section, and welding a salvage yard vehicle half to your vehicle. This is a dangerous practice, voids any manufacturer's warranty on the vehicle, and exposes the owner to titling issues. A subsequent accident in a vehicle "repaired" using this technique could easily be fatal.
This is a picture of a vehicle repaired using the "clip" technique, after it was broadsided by a motorcycle. As you can see, the vehicle ripped apart.