The current definition of this term is anyone who thinks he/she's increasing the performance of his/her car but is actually uglifying it as well as reducing it performance.
Sometimes, this word is mistakenly used to refer to a tuner
Example of a ricer: Owns a Honda Civic with a GTR badge on the gas tank cover, a big bodykit that actually increases drag and thus decreases performance, an exhaust that almost eliminates back-pressure and thus decreases performance, stickers everywhere, a really tall spoiler that gives the car more drag and thus reduces performance, huge chrome rims, thin tires which don't have a very long life, added weight (audio systems, the bodykit, the huge spoiler, etc.), bottles of "NAWWS", etc.
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.
Buy the mug