The technical term is mondegreen-originating in 1954 when American writer Sylvia Wright published an essay in Harper's Magazine on her own lyrical disillusionment.— Queen's Journal: Latest stories
It might be a mere mondegreen, but it makes a much better song.— AMERICAN DIGEST
I love a good mondegreen, but for the life of me I can't figure out which line you'd mistake for "We all need kung fu."— Popular Comments Across MetaFilter
Or is it a subset of mondegreen, maybe?— MetaFilter
Mondegreen has been looked up 382 times, favorited 8 times, listed 79 times, commented on 11 times, and is not a valid Scrabble word.