Aside from its usual definition, a racial slur is also what happens when you mix rednecks, NASCAR, and mass quantities of alcohol. Everyone is incoherently slurring about the race, when in actuality, no one has a damn clue who's in the lead or what the point standings are, nor does anyone really give a shit.
Examples of Racial Slurs:
Lap 1, Billy Bob - "Jimmy Johnson's taking this one all the way!"
Lap 1, Jimbo - "I concur, but Tony Stewart has just as much of a chance as any other guy out there."
Lap 119, Billy Bob - "Ib ert shnell mmm, (hic) mmbobble sox."
Lap 119, Jimbo - "Yeeeerrrp, sho mmbrithen gnop shtorin(BUUUURRRRRP)."