An onomatopoeia, badumchi is the sound of a quick drum riff, two snare beats followed by a cymbal clash, usually played after a joke has been told.

The "CHI" of badumCHI is written in caps to represent the respectively loud cymbal compared to the two beats of the snare preceding it.
Comedian: Diarrhea runs in my family.

BadumCHI
by DougYoung April 22, 2009
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