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1.
To rice, or to soup up a crappy car with the mistaken idea that type 'R' stickers and performance yellow paint makes it go faster.
"Did you see that guy? He be ricing!"
by Anonymous May 20, 2003
 
2.
Making improvements to a system that don't actually do anyone any good, and can sometimes have negative ramifications
Encoding videos at 300FPS when humans stop noticing the difference after a fraction of that, that is ricing in the pure sense.
by VubeGuru March 08, 2013
 
3.
To race with stupid riced out cars. Rice is the same as a race only much slower.
Do you think that honda with the weed wacker exhaust is out ricing tonight. Do you think he would rice me.
by southern biker June 10, 2007