An event where one loudmouthed fuck will not shut the fuck up turning the entire room into an audio war crime as society collapses in real time while everyone else sits there hostage too polite or too tired to tell them to superglue their stupid lips together and cease all mouth activity forever.
"The car ride turned into a yappocalypse when he started talking at mile one and was still yapping when we hit the gas station."
Someone (usually one with authority) who is exceptionally skilled at yapping and boring anyone out, even people with the best attention spans. They usually have something important to talk about, and usually end up speaking about something way off topic.
He's such a yappologist - he will turn any 10-second explanation into a full blown TED talk.