Kano Eiko is a Japanese comedian known for eccentric characters and live stage work, and this short line comes from one of his live performances. The phrase translates roughly to the ground collapsed because of the rain, which explains its spread among Japanese meme pages and soundboards. Short deadpan lines like this travel well because the meaning stays clear even out of context. It is now shared mainly as a reaction clip for rain, damage and sudden failure jokes online.
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Japanese comedian Kano Eiko says the ground collapsed from the rain in this short live clip, used as a deadpan reaction and meme sound effect online.
The clip captures Kano Eiko delivering the line ame de jiban ga ochitanda in a flat, matter of fact tone during a live performance. He states that the ground has given way because of the rain, as if reporting ordinary news. The humour comes from the contrast between the serious disaster wording and his calm delivery. It lasts only a couple of seconds, which makes the deadpan phrasing land like a punchline and leaves viewers with an oddly memorable, quotable reaction sound.