noun: In the 1970's, there was a television series based on then-popular DC comic characters Batman and Robin, though the show was simply titled 'Batman'.
In the show, without fail, Batman would dramatically reveal the evil plot of the villan for today's episode to Robin, who would then blurt out the word "Holy..." followed immediately by a creative, often alliterate, and always annoying catchphrase relating to the dramatic plot twist.
Such a phrase is now referred to as a 'Robinism'
1)a phrase uttered to add humor to a tense or dramatic situation, by way of attempting to increase the drama or tension in a rediculous manner.
2) The word 'Robinism' itself can refer to any phrase or action that is overly dramatic, to the point of being rediculous. see Robinesque
See below for an example of a Robinism, whose source I now forget.