noun. Geologically speaking, holy mother of excrement.
Real citation: "I had my first experience with a poop explosion. It wasn’t an up the backer like Christine has had to deal with, but it was pretty disgusting. It leaked out of the side of his diaper and onto his onesie and clothes. That was only the tip of the poopberg."
("Random Thoughts from a Daddy," Feb. 20, 2005, Growing Up Lucas-Mullen, http://www.lucas-mullen.info/liampaul/?p=57)
Made-up citation: "When walking my dog, I always wait a minute after a dump before tossing away that precious little plastic bag o' poop. The first crap just might be the tip of the poopberg."