That's when a person hears an unfamiliar term and assumes it's some sort of insult. Named for a phrase occurring in Mark Twain 's Roughing It. I also remember an episode of Cow & Chicken where a character's Sesquipedalian Loquaciousness got him in big trouble. Also, the author of Sonichu once took exception to "benevolent".
Hello, Unknown Troper. You'll need to get known to lend a hand here.