Your balls did accidentally touch another mans balls without you knowing. Now you got a bacterial infection. Since bacteria is resistant against antibiotika now, you probably have to amputate.
The microbiome of our skin is delicate. Kill the unhealthy stink producing bacteria with some tea tree wipes. Then eat healthier, shower less often and with lukewarm water and a mild soap. Use a healthy bacteria spray daily to rebalance your skin flora (or roll around in the dirt if you're cheap).
It isn't normal to stink really bad on the same day you showered, even your stank zones (pits/balls/ass). You gotta fix that shit bro.
It's swamp cock. very similar to swamp ass but 100 times worse. Air them out after washing and pray the stank subsides. It won't do much long term, though, given the current weather.