To vent frustration by riffing creatively about a situation. This is not the same as kvetching or bitching, though it is a form of complaining. A good chemp is funny. The person or people who chemp or listen to a chemp walk away feeling that the situation still sucks, but at least they can laugh about it.
"Yes, I know the IT department is a black hole. I just didn't realize that I could pick up the phone, dial the IT department, and experience first-hand the joy of talking to an incoherent piece of quantum string. I didn't realize that when unobserved they are alive and dead simultaneously, like Schrödinger's cat. And I did not know that attempts to manage them or check on their progress resulted in a perfect example of the Quantum Zeno effect."
It was ok when you were chemping, but now you're just bitching.