mannvitsbrekka

Etymology
From. The meaning of the second constituent has not fully been determined, but is possibly used as a emphatic suffix to mean “a paragon of wisdom”. Found in archaic speech, two women have the nickname mannvitsbrekka in Landnámabók (“The Book of Settlements”)

The oldest example of the word from later usage is from 1915, but it is generally used sarcastically.

Noun

 * 1) genius; a sarcastic way of referring to a person's wit
 * 2)  a hill of man's wit, a paragon of wisdom