wisenheimer

Etymology
First used in the early c. 20 From + the  demonymic ending -enheimer.

The form might be an alteration of the similarly formed and synonymous (19th c.), possibly influenced by  and/or involving a pun on. On the other hand, the surname actually exists, both in Germany and the US. It goes back to the towns of and  (both in Palatinate).

Noun

 * 1)  A self-assertive and arrogant person; a know-it-all or smart aleck.
 * 2) * 2010, J. Bolton-Fasman, "Debating Salvation: A smart aleck finds his niche" The Jerusalem Post 11/11/2010 On-line, accessed November 13, 2010 (quotations are from Wisenheimer: A Childhood Subject to Debate by Mark Oppenheimer (Hardcover - Apr 13, 2010)):
 * "It wasn’t until I read Mark Oppenheimer’s charming memoir that I had an apt description of my son: “…a smart aleck is a smart guy gone bad, a boy whose smartness is being used stupidly, while a wisenheimer actually lacks wisdom. He might not be cruel, he might not mean harm, but a wisenheimer is a smart guy you wish had a little less smarts.”
 * 1) * 2010, J. Bolton-Fasman, "Debating Salvation: A smart aleck finds his niche" The Jerusalem Post 11/11/2010 On-line, accessed November 13, 2010 (quotations are from Wisenheimer: A Childhood Subject to Debate by Mark Oppenheimer (Hardcover - Apr 13, 2010)):
 * "It wasn’t until I read Mark Oppenheimer’s charming memoir that I had an apt description of my son: “…a smart aleck is a smart guy gone bad, a boy whose smartness is being used stupidly, while a wisenheimer actually lacks wisdom. He might not be cruel, he might not mean harm, but a wisenheimer is a smart guy you wish had a little less smarts.”