I have no clue what xenomorphs are, but I believe you owe them a huge apology equating DUmmies to them. I do not believe it's possible to equate DUmmies to anything except themselves-some are worse scum sucking bottom feeders than others but that's all.
Boud, it's ultra-geek shorthand for the alien of the
Alien movies. I say ultra, because it's also laughed at by the space marines in
Aliens when their Lieutenant, Gorman, calls the alien that, so it has some slight in-jokiness to it too, in a sad, we-think-Star-Trek-is-real-lame way.
I'm sorry, fictional, murderous, parasitizing, hideous aliens of the
Alien movie franchise. Comparing you to the DU was a slur on all self-respecting, rapacious acid-blooded carnivores everywhere who lay eggs that spawn facehugging parasites that then lay
their eggs in humans and other animals, to grow and burst out, killing the host.
Now, if someone would be so kind as to kill me, please.