A thoughtless action resulting in tragic consequence great in extent, or size.
Mao Zedong's "Great Proletarian Cultural Revolution" was a monumental folly .
Description of Einstein's theory of relativity's one limitation in which special relativity is unable to apprehend compositive light and general relativity is unable to measure the distance between any two photons in a single line.
Einstein's Folly states that general relativity is unable to measure the distance between any two trienes or Riemann time-series in a Riemann function.
A two word term used to describe the foolishness in both typos and the spedecial errors in one certain person's life... You know who you are!
(Commonly used through out common wealth of Pennsylvania)
Person 1: Help, the URL isn't working!
Person 2: You spelled follis musem, not fossil museum... You... How!??... UGHHGHGHH.
Person 3: This is follis musem in it's purest of forms.
An exclamation of anger, concern for the others well being, and an affirmative of the stupidity of others.
You're a folly fish.
Ye, all schizo folly fishes, slimey and wet ye all are! Die.