Oh haha never heard of it! Well you can still visit Belgium, but please stay away from the Flemish part. Specially the West-Flemish part!
Double dutch means unintelligible or garbled speech:
https://www.dictionary.com/browse/double-dutch
I was going to do a joke something like "Don't translate it twice" 😂
I'm banned from Holland now. Can I still visit Belgium?
It's also a famous music track about skipping ropes from the 1980's in the UK, very good sound track:
Discussion
😂