Short scam-call greetings became a reusable joke online as spam and robocalls grew more common, with creators lifting brief pickups to stand in for the caller on the other end. This yeah hello version is used as a shorthand for a scammer who has just taken the bait, so viewers understand the setup without any backstory. It circulates in prank and scam baiting clips, gaming voice chats and short skits, where the flat greeting alone signals a dodgy call centre, a fake support agent or an unwanted sales call.