(informal noun, regional to the American Midwest)

1. a thunderstorm
When that thunderboomer rolled in last night, all the dogs hid under the bed.
by Jno. Aubrey March 20, 2018
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1: A raucous thunder storm

or

2: an explosive and noisy shit
I just dropped a huge thunderboomer in your toilet
by Nipzie July 27, 2016
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