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When someone’s bowels are about to explode and they start wiggling their butt like a confused goldfish on a trampoline.
My cousin did the ba-dump-a-dump in the middle of the grocery store and scared a kid half to death.
I saw my dog doing the ba-dump-a-dump on the living room floor like it was a dance-off.
My boss did the ba-dump-a-dump during a meeting and the whole room started laughing like it was the end of the world.