1. Diddly-John is another name to describe your testicles.

2. It can also be used as an exclamatory remark (in place of things like ‘wow!’)
1.
Mom: ‘Did you remember to wash your Diddly-John’s in the shower?’
Son: ‘Why yes! I did!’

2.
Dan: ‘Holy crap! That guy’s car almost hit us!’
Paul: ‘Diddly-John! That was a close one!’
by toosillyforthisworld June 22, 2023
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