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."
"andy just took a fat shit and his bro door almost passed out from it."
by chadbrochill44 May 2, 2010