As sung by ZZ Top and as used by gearheads/motorheads for decades a coon tune is a tune up without new parts. Clean the plugs, set the dwell and timing, adjust the carb. This was done before a race or a night of cruising that some action with other cars was expected. After the night out, the car was detuned for easier driving and better mileage. Don't know if it's racist or not but black folks back in the day generally didn't have a lot of bread. Don't hear it used much anymore probably because it sounds it.

Your local hood music where u may find the one and only Kodak black or lil baby on your play list