I think you gotta speak American for it.

All the vowels are just tending towards 'ah'. *

"John's process for congress progress?"

"Nah, Jahn's prahcess for cahngress prahgress."

* Except for the ones that should, like laugh->läff

I missed a joke in the d&d movie. They gave a guy some dumb/made-up name "Jarnathan", which was hilarious apparently. But to my ear , it just sounded like the usual way Americans say Jah instead of Joh.

Same with "Meet the Fockers" I guess? Fuhckers sounds like fuhck.