Politically Incorrect

S. and Tot have this thing where they squeeze each others noses and say 'Honk, Honk.' Yesterday, S. said to Tot,"Let's do our honkies." It took every fiber of my being not to laugh. I don't know what to say to him to get him to stop saying that. After all, he'll be starting school next week, and I don't think saying 'honkies' in class is the best way to start the year! Plus, can you imagine what his teacher would think about his home life? Hey, at least we ARE white! Any ideas on how to approach this???