Definition
An unofficial holiday celebrating the bond between best friends (of any gender)—a day dedicated to appreciating how cool your bestie is and how cool they think you are, usually involving inside jokes and mutual admiration that last a lifetime. It's basically friendship fanboying, but sanctioned.
Example Usage
We haven't hung out in weeks, so we declared today national bro day and did everything together.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=national%20bro%20day&defid=14349728)
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