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1. To beat the rhythm of something, such as a song, so that someone can learn it. A noun or pronoun can be used between "drum" and "out." Drum it out again, and I'll try to play along this time.
2. To oust someone publicly, often amid scandal. A noun or pronoun can be used between "drum" and "out." The CEO was drummed out once the papers started reporting on his embezzlement of company funds.
drum something out
to beat a rhythm, loudly and clearly, as if teaching it to someone. Drum the rhythm out before you try to sing this song. Drum out the rhythm first.
Expel or dismiss publicly and in disgrace, as in They drummed him out of the club. This usage, which alludes to dismissal from a military service to the beat of a drum, began to be applied to civilian expulsions in the mid-1700s.