This line comes from the time card style used in SpongeBob SquarePants, where a narrator announces exaggerated jumps in time such as '2000 years later.' These title cards became widely reused in online meme edits, captioned videos, and short-form comedy because they communicate a long wait instantly. The sound remains popular because it is recognizable across generations of internet users and fits many situations, from stalled gameplay to delayed text replies. It is often used in the same kind of reaction edit space as bruh.