Drabblism

A term used when describing a misheard song lyric. It refers to a word made up out of thin air when you don't know what is actually being sung.

"There's a bathroom on the right" (Bad Moon Rising)
"Excuse me while I kiss this guy" (Purple Haze)
"I'll never be, your big stuffed birdie" (Beast of Burden)
"I wrote a letter full of drabble (drabblism) and trite confessions" (Plundered My Soul)