Rice burner is a pejorative describing Japanese-made — or by extension, Asian-made — motorcycles and automobiles. The term is often defined as offensive or racist stereotyping. In some cases users of the term assert that it is not offensive or racist, or else treat the term as a humorous, mild put-down rather than a racial slur. The term is most often used against east Asian made vehicles where the population is presumed to subsist on a diet of rice.

I drive a Japanese vehicle and I have never even tried to put rice in the gas tank

Only an "IGNORANT JACKASS" would say that.