noun
or weis·en·heim·er ˈwīz ə nˌhīmə(r)
( -s )
Etymology: wise (II) + German -enheimer (as in German family names such as Guggenheimer, Oppenheimer)
: one who has the air of knowing all about something or everything : wiseacre
emerges from comparative obscurity to national prominence — much to the … chagrin of the wisenheimers — Arthur Godfrey