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This meme originated from an interview with an elderly woman on a YTN news report about a mayfly swarm on May 19, 2006. From the mid-2000s, the grandmother's unique pronunciation and vivid expressions gained significant attention online, becoming widely used as material for comedic edits and parodies. Even 19 years later, it continues to be re-evaluated and utilized in various content. When mayflies reappeared in Jamsil in 2023, this meme once again garnered attention.

'Horollollo' is a mimetic word derived from an interview with an elderly woman describing a severe mayfly swarm near Amsa Station on Seoul Subway Line 8 in 2006. At the time, the grandmother vividly expressed the overwhelming quantity and chaotic movement of the mayflies, which flew in like a swarm of bees, with the sound "hol-lol-lol-lol-lol-lol-lol-lol." Since then, this expression has become a mimetic word used not only for mayfly swarms but also to describe any phenomenon or object approaching with immense momentum or in overwhelming quantities, or to represent the appearance of great power or an ominous force.

Hoh-roll-loh-loh (pronounced roughly as "hoh-roll-loh-loh," with the 'o' sounds similar to 'oh' and a clear 'l' sound).

This meme gained significant popularity among young people in their late teens to early thirties who enjoyed internet synthesis culture in the mid-2000s. Currently, it is widely used across all age groups who consume internet memes. It frequently appears in the works of webtoon artist Lee Mal-nyeon, making it a familiar expression to webtoon readers as well. It is difficult to pinpoint a specific target demographic.

• "As soon as the sun sets, it shines brightly, so they fly in like a swarm of bees. It's a historical event, hol-lol-lol-lol-lol-lol-lol-lol-lol they fly up... Then customers brush their clothes, worried about getting bugs on them, 'hwo-rol-lol-lol-lol' and so on..." (Original interview content)
• "What is life? It's Horollollo!" (A common line used by artist Lee Mal-nyeon in his comics)
• When describing a situation where mayfly swarms or other insect swarms are approaching in huge numbers.
• When something rapidly progresses out of control, or an overwhelming quantity pours out all at once.
• It can also be used as an exclamation to express surprise or bewilderment.

Note on Usage: The elderly woman who gave the original interview is aware that her interview became known and parodied online. In 2020, through the "Geunhwang Olympic" channel, she expressed a positive stance, stating that it is fine for people to continue using it.