1. An internet video clip of an epic explosion. Many people use this in case of weegee or some other catastrophic event occuring.
2. A internet meme which people say when some one nterrupts there conversation: like a ninja.
Weegee: You will DIE.
Person: WTFBOOM!!! *explodes*
Person A: So what else u wanna talk about?
Person B: I really don't kno-
Random Noob: HAI THERE
Person A: WTFBOOOOOOOOOOOOOOOOOOOOOOM *explodes*