rum-ti-tum
/ˌrʌmtɪˈtʌm/exclamation
Used as a meaningless refrain or to represent a regular rhythmic sound.
noun
Rhythmic repetitiveness, especially in music or verse; an instance of this.
adjective
Especially of music or verse: repetitive, trivial, commonplace.
Origin
Early 19th century; earliest use found in Trick for Trick. Imitative of the sound of a drum roll. The some forms show alteration of the ending apparently for the purposes of internal rhyme. With the use as adverb, compare rum-ti-too.