The line comes from gaming meme culture around the Murder Monkeys, the crazed monkey enemies known from indie horror games. The phrase plays on monkeying around, which made it an easy caption for clips where someone provokes trouble and gets caught. It circulated on meme soundboards as a short taunt for fails, pranks and jumpscare edits, where the familiar monster name gives it instant context. Creators keep using it because the joke needs no setup and the delivery makes the punishment feel funny.