Origin of the word: pumpernickel: German for “fart goblin”. Who knew? This from Wiktionary:
From Westphalian German Pumpernickel, from Pumper (“fart”) (or a related form, such as pumpern) and Nickel (“rascal”) (from the male name Nikolaus (“Nicholas”)), possibly originating as an insult for a person or for the bread itself by outsiders