Wikipedia
Muggeseggele
A Muggeseggele or Muckenseckel is a humorous Alemannic German idiom used in Swabia to designate a nonspecific very small length; it refers to a housefly's penis (or literally its scrotum, i.e. its aedeagus). It has been called the smallest Swabian unit of measurement and plays a similar role in northern Baden-Württemberg and Franconia.
The term Muggeseggele has an iconic character and is one of the most preferred Swabian idioms. In a 2009 readers' survey by Stuttgarter Nachrichten, the largest newspaper in Stuttgart, Muggeseggele was chosen as "the most beautiful Swabian word" by a large margin.