Ragnarok Online is a long-running MMORPG developed by Gravity and first released in South Korea in 2002, based on the manhwa by Lee Myung-jin. Yoyos are low-level monkey monsters found around Payon and other early areas, farmed by new players for experience and drops. Their death sound became familiar through repetition during grinding, and short clips later circulated on soundboards and in gaming edits. It survives less as nostalgia for the fight itself than as a compact, recognisable signal for a small creature being knocked out.