Mouse on a Moped
The phrase used by an adult who just "farted" to convince a young child that the flatulence they just heard didn't really come from said adult.
Uncle Eddie: "PPPPFFFFFTTTTT"!!
Niece Lilly: "Uncle Eddie!!"
Uncle Eddie: "That wasn't me honey, that was a mouse on a moped!"
Niece Lilly: "Uncle Eddie!!"
Uncle Eddie: "That wasn't me honey, that was a mouse on a moped!"