Definition of Mickey-Mousing in US English:

Mickey-Mousing

noun

Music
derogatory
  • The matching of the musical soundtrack of a film, etc., to the details of the accompanying action, in a manner reminiscent of animated cartoons.

Origin

1950s; earliest use found in Grove's Dictionary of Music. From Mickey Mouse + -ing.

Pronunciation

Mickey-Mousing

/ˌmɪkɪˈmaʊsɪŋ/