wisenheimer

or weis·en·heim·er

[ wahy-zuh n-hahy-mer ]
/ ˈwaɪ zənˌhaɪ mər /

noun Informal.

a wiseacre or smart aleck.

Origin of wisenheimer

1915–20, Americanism; earlier also wiseheimer, equivalent to wise1 + - (en)heimer, extracted from surnames with this ending