“Finish Him” comes from Mortal Kombat II, the 1993 arcade fighting game known for its announcer calls and finishing moves. The line appears when a match is won and the player gets a brief chance to perform a fatality. Over time, the clip spread beyond arcade culture into YouTube, TikTok and meme edits as a universal cue for an inevitable defeat. It is still widely used because even people who never played the game recognize its over-the-top finality.