mondegreen
A humorous mishearing of a word, phrase, or especially song lyric. In Japan, the phenomenon is known as "soramimi", with a famous example being the line "Dansa med oss, klappa era händer" in Caramelldansen being misheard as "バルサミコ酢やっぱいらへんで" (barusamiko-su yappa irahen de).
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