mon·de·green 
(mŏn′də-grēn, môn′-)
(mŏn′də-grēn, môn′-)n.
A series of words that result from the mishearing or misinterpretation of a statement or song lyric. For example, I led the pigeons to the flag for I pledge allegiance to the flag.
[After (Lady) Mondegreen, a misinterpretation of the line (hae laid) him on the green, from the song "The Bonny Earl of Murray".]