A scene being played out in the Gryffindor common room, circa 5th or 6th year.
Ron, who was feeling pretty bored and, truthfully, trying to avoid studying, asked out of nowhere, “So what do you think that arsehole will do next?”
Jumping in indignantly, as always, Hermione admonished, “Language, Ronald.”
“Aww c’mon Hermione. It's only the truth. He's a total wanker. A Thug too! Along with his Death Eater mates.”
Harry, trying to ignore his bickering friends as usual, pricked his ears up at that. “Ron, you're brilliant!”
“Umm, what? Don't you mean Hermione, mate?” The redhead was confused by Harry's words.
His friend replied, “No, think about it. He's got that nasty protection on his name and You-Know-Who is stupid as far as names go. But you said it perfectly, Total Wanker and Thug. T…W…A…T! That means his new nickname is TWAT!!! Can you imagine just how ticked off he's going to be when he hears we're calling him that?”
After taking a moment to consider Harry's words, Hermione replied, “Now, you know I'm not normally one for swearing, but in this case it's actually quite brilliant. Well done, you two. TWAT it is. Oh, even better, if we're making fun of him anyway. We could take it to the extreme and use Lord Twat!!!”
The boys dissolved into laughter at her words, ending up on the floor, rolling around and exchanging high fives. Which naturally drew the attention of the rest of the common room. Between gasps for air and guffaws, they explained the gist of it all to their fellow Gryffs, to their great delight and entertainment.
As might be expected, the moniker Lord Twat was known across the school and the professors by lunch-time the next day, even if the entirety of Slytherin House determinedly pretended they hadn't heard it at all.
After multiple rounds of Wand, Parchment, Boulder in their common room, it was decided that they would all pretend ignorance and avoid sending letters home for the foreseeable future, so that none of their relatives would be required to endure the Dark Lord's wrath on hearing the new appellation.
Which meant the rest of the students had greater access to the school owls, if they didn't own one themselves. Which also meant that the new nickname travelled to the far reaches of the British Wizarding world within twenty-four hours. This was, of course, ably assisted by the front page of the Daily Prophet, given that Barnabas Cuffe, the editor, had two nieces in Hufflepuff who were happy to supply regular updates from Hogwarts.
Witnesses, who remained forever nameless, reported that Lord Twat threw an epic tantrum on seeing the headlines of the Daily Prophet and vowed revenge on anyone using that insulting name. What was never said was that those Death Eaters were snickering madly as they relayed the news to those outside of Lord Twat's primary circle of supporters. After they stopped screaming and shaking from the Cruciatus curse that is, but that's another story for another time.
The moral of this story? Even Quidditch mad teenage boys can have clever ideas. Occasionally!