noun. They are sometimes known as rugrats, miniature adults, elves, gnomes, spawn, or house apes.
Real citation: "When they were in bed together, I couldn't even look at the screen. I was like 'no sex...please...no sex'. But then the boy came in. Thank God. Ahhh...children - nature's cockblock."
(MysticRose, "Nip/Tuck," Nov. 10, 2005, Television Without Pity, http://forums.televisionwithoutpity.com/index.php?showtopic=2864952&view=findpost&p=3943697)
Made-up citation: "If it weren't for nature's cockblock, there would be even more of nature's cockblock. And the world would not be peopled. Or would it?"