läck Bobby

Etymology
Likely emerged after 1895-1905, because of its absence in whose volumes in which it should have been listed were published in that time. Probably emerged as a minced oath of as swearwords have the tendency to also be used as interjections of astonishment. The Bobby part is unlikely to be from English but rather a diminutive of the male given name, analogous to other Alemannic swear words involving given names such as from.

Interjection

 * 1) good Lord expression of astonishment