Derogatory slang for a person whose partner is Asian/of Asian descent and whom they consider a "trophy", "toy", or just lazy/a "user".
Said person may be either an (un)willing and/or (ub)witting participant, depending on what they perceive they are getting out of the relationship. Sometimes used as self-deprecation.
"Once I started dating/married him/her, (s)he turned me into a real rice hauler."
A derogatory term used (usually) by young american males to describe foreign trucks. See rice rocket.
Jesse refused to buy a rice hauler. He only likes Chevy's.