Ba Dum Ching 

Used to underscore or acknowledge a joke imitating a drum roll and cymbal crash.

For example:
1. knock knock
2. whos there
1. broken pencil
2. broken pencil who
1. nevermind... its pointless
2. ba dum ching

Ba Dum Ching by ellenbobellen April 6, 2020

badum-ching 

n. 1) see Rimshot. 2) The sound made from a Rimshot. 3) A sarcastic remark in place of feigned laughter.

Person 1: Why did the chicken cross the road? To get to the other side! Get it? Get it?
Person 2: Badum-ching!

badum-ching by d_art February 5, 2006