dat brengt moesje niet naar Parijs

Etymology
Literally "that won't get mum to Paris". Corruption of ultimately dat brengt monsieur niet naar Parijs ("that won't get Monsieur [a Frenchman] to Paris"), compare Sranan Tongo ("Frenchman"). Cognate of 🇨🇬.

Proverb

 * 1)  it doesn't have a significant effect; it's not a useful contribution; it doesn't advance the matter