It's a racist slur used to denigrate people of Dutch descent, particularly in the context of early American history. The term likely originates from the perception that Dutch settlers were less refined than their English counterparts, and thus associated with unpleasant tasks like cleaning up waste and using chamber pots.
It's important to understand that this term is deeply offensive and should never be used.
While it might occasionally be encountered in historical literature, it's crucial to recognize its hurtful nature and avoid perpetuating harmful stereotypes.