That terrible foot odor is caused by bacteria that are always on the skin of your feet feeding on the sweat that your feet always produce. The bacteria then excrete waste with that awful aroma.
The process is normal and natural.
The aroma may be normal and natural, but it is also really bad. No one wants to have it and no one wants to be around anyone who has it.
If you are afflicted or know someone who is, listen up:
If you have washed your feet, changed your shoes and socks, aired out your feet, tried all sorts of expensive, smelly sprays and powders and still have stinky feet visit STOP-STINKY-FEET for some real help.