I guess ill be the one to keep this on topic:
Hoons are drivers, generally young ones (avoiding the stereotype) who have no respect to authority and others. The people cops catch drag racing etc. at night are reffered as hoons by them and basiclly give all imports a bad name. Not all import drivers are reckless and many people here obey road rules and respect the law.
Rice is a term used to describe a car made to look good but no actual power under the hood. Basically "all show, no go". An example would be a non-turbo honda integra with HKS, apexi... etc stickers all over it and pulling something along the lines of the power output of lawnmower.
Hope it helps