A word used to generally show displeasure in the circumstance at hand (note that the word should be used plurally). Warning: the thought of "junk monkeys" often brings about images of primate orgies. Word should be used at random.
"Junk monkeys, I forgot to torch the car after we left the dead body in it. "
"We're going to be late to the strip club, junk monkeys!"
Mother- "We're out of Frosted Mini-Wheats®" Son/Daughter - "Junk monkeys!"