"I shall talk to you like a Dutch uncle" is another saying, not in this case contemptuous but rather complimentary--signifying "I'll dress you down to some purpose".

One piece of slang we share with Holland: the reference to the pawnbroker as an uncle.

In Holland the kindly friend at the three brass balls (which it may not be generally known are the ancient arms of Lombardy, the Lombards being the first money lenders,) is called Oom Jan or Uncle John.
There is still another phrase, "Dutch news," which might be explained.

The term is given by printers to very difficult copy--Dean Stanley's manuscript, for example, was probably known as Dutch news, so terrible was his hand,--and also to "pie".

The origin is to be found in the following paragraph from _Notes and Queries_.