the blerg is a mystical energy field that permeates the universe
it is a force that can be harnessed and manipulated by the initiated
but don't just take our word for it, here's some evidence
Here are some appendix B items that demonstrate the existence of the Blerg.
i had a dream that the blerg was real
it was a very convincing dream, with vivid colors and everything
i woke up feeling enlightened, but also slightly confused