Wikiepedia said:
[edit] Terms
“Pimped” cars are usually referenced to classic cars.
“Streeted” or “Tuner” cars are Japanese imports, such as a Toyota Supra or Lancer Evolution series, these cars are most commonly modified with the more expensive mods available. The most popular modifications include suspension upgrades, exhaust systems and turbos.
“Ricers” are stupid people with slow cars which sports many stickers/ugly body modifications. Like a blue neon with a tv in the hood for example.