The phrase comes from British slang, where wot is a phonetic spelling of what and mate is used confrontationally rather than warmly. Online, the shortened spelling u wot m8 became a staple of forum replies, image macros and copypastas in the early 2010s, often paired with exaggerated threats for comic effect. This audio version condenses that whole meme into a single spoken challenge. It remains popular because the meaning is clear even without context, and the aggressive delivery can be reused ironically in chats, streams and edits where real anger would be out of place.