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 âwow!â)
1.
Mom: âDid you remember to wash your Diddly-Johnâs in the shower?â
Son: âWhy yes! I did!â
2.
Dan: âHoly crap! That guyâs car almost hit us!â
Paul: âDiddly-John! That was a close one!â