>>1587024Its not a made up definition.
It comes up in a lot of places. Its used in the desktop threads on /g/, /wg/ and /w/. As well as multiple other forums not just on 4chan.
The most common place to see it is when talking about cars. A "rice burner" is an Asian made car that has a shit load of aftermarket parts put on it, so it looks and sounds fast, but it still sucks on the track. Think a Honda civic that looks like a subaru sti but still drives like a civic.
All those pointless unnecessary attachments, mods, and customized styling are called "rice". Ricing is the act of making those customizations.