1) The belief that a particular rice is superior to others.
2) Discrimination or prejudice based on rice.
Nate: Please pass the white rice.
Curt: Why's it gotta be white?
Nate: What? I like the white rice better.
Curt: You got a problem with the brown rice? What, are you ricist ??
(This is a direct transcript of actual events. The names have been changed for an inside joke.)