It's in the f%@king dictionary.
http://en.wikipedia.org/wiki/Ricer
"Ricing" (a term usually not used by the modifier himself) a vehicle is meant to emulate the work of independent automotive tuning companies who modify more than just appearance, and to give an appearance of greater ability than the car actually has. Ricing is generally looked down upon amongst people who actually modify the running parts of the vehicle itself, e.g. engine tuning.
Common aftermarket modifications in this style, or "rice," can include:
.....
neon and LED lighting, such as lighted windshield washer nozzles, underbody neon lights, etc.