Action Bronson finally reveals the big secret ... what he did behind closed doors -- specifically, whether he dropped a deuce during his infamous port-a-potty rap performance?
TMZ posted the epic clip ... showing the "Shiraz" rapper ducking into a port-a-potty during his performance at the Ottawa Bluesfest ... and not missing a beat.
In addition to addressing #1/#2 matters, he also unveiled his plan for topping that stunt.
It won't be pretty.
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