Originally used to take ones mind off the subject at hand, Meep is now used as a notification of Change of Subject. Meep Can be used when one feels uncomofrtable with the current topic.
In stories he wrote in the 1920s and 1930s, H. P. Lovecraft used the word meep to represent the vocalizations made by ghouls. Lovecraftian ghouls were subterranean humans that had degenerated into dog-like cannibalisticcreatures.
A man he had known in Boston ... had actually made friends with the ghouls and had taught him to understand the simpler part of their disgusting meeping and glibbering." ~ in "The Dream Quest of Unknown Kadath"
The art of 'meep'ing occurs when a person uses the term in the form of onomatopoeia. The word itself is just a sound that is used to avoid awkward silences or to brighten up the mood of an individual.
Matt: meep! 'Matt was 'meep'ing on the long carjourney home to avoid any awkward silences.
Matt: meep! 'Matt was 'meep'ing as he enjoys the art of 'meep'ing and does it to pass time.