The phrase comes from Russian internet slang, where dep is short for deposit and depnul is the past tense a player uses after funding an account. The clip circulated on Russian language soundboards as a short reaction for gambling and gaming moments, with the existing caption stretching the word to depnuuul to match the vocal delivery. It spread because the joke translates easily, pairing a mundane payment action with dramatic pride, and it is still dropped into streams, edits and chat soundboards whenever someone funds a risky play.