Senseless talk; nonsense.
[Perhaps from an unattested American colonial Dutch use of Dutch poppekak, doll's excrement (in contemporary Dutch, found mostly in variants of the expression zo fijn als gemalen poppekak, excessively pious (literally, as fine as powdered doll's excrement)) : pop, doll (from Middle Dutch poppe, from Vulgar Latin *puppa, from Latin pūpa) + kak, excrement (from kakken, to defecate, from Middle Dutch kacken, from Latin cacāre; see kakka- in the Appendix of Indo-European roots).]
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.