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a barrier of privacy that a close friend will provide at a time when there is no bathroom door available. typically needed at shitty rundown bars where bathrooms and stalls lack anything close to a functioning door
"hey i need to fucking shit but there's no door on the stall, give me a bro door!"

"andy just took a fat shit and his bro door almost passed out from it."
by chadbrochill44 May 01, 2010
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