(1) The defining moment
in which one's sense of judgement finally aknowledges
its idiocy, but is to late to correct the error that has occured during said
period of idiocy.
(2) The point in time when you realize you have
fucked up big time.
(1) The stuntman experienced an oh-shit moment when
he reached the apex of his motorcycle jump and he was 300 yards from
the other side of the canyon.