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Any inferior or crap car or motor cycle that has been tricked up to look good. Janky is for the Crapness and inferiority of the vehicle and rice rocket refers to how it is tricked up to look flash and (japanesey)
Hugh: Yo Ted, Check out Mcfarlane's car it looks pretty ruthless.
Teddy: Na man that thing is just a Janky Rice Rocket i wouldnt touch it with a 50 foot pole.
by not Janky May 13, 2011