Chan is sound of a chime, pon, the sound of a hand drum. When played simultaneously the result is a dissonant, jarring sound. Chan-pon is used to mean the result of mixing things together that should not be mixed, often with unfortunate consequences-whiskey and beer, spaghetti and Japanese miso soup.
A: Kinoo wa doo shita no?
B: Sake to biiru o chan-pon ni nonda n de, hidoi futsuka yoi de sa. Totemo asa jogingu ni iku yoona jootai janakatta n da.
A: What happened yesterday?
B: I mixed drinking sake and beer, and I got this terrible hangover. I was in no condition to go jogging in the morning.