The greeting comes from SpongeBob SquarePants, the Nickelodeon cartoon that began in 1999, where Eugene Krabs runs the Krusty Krab and talks like an old sea captain. Voiced by Clancy Brown, Krabs uses ahoy as his regular nautical hello for SpongeBob, his fry cook. As short cartoon clips moved to soundboards, TikTok and YouTube edits, this drawn out welcome became a reusable reaction. People post it to announce themselves, greet a group chat or mock a dramatic entrance, keeping the joke alive long after the episode aired.