A Binancian is a die-hard fan of Binance, kind of like a Belieber but for crypto. They're the ones who wear Binance hoodies, have Binance posters on their walls, and defend Binance against any and all haters online.
Example
"He's such a Binancian, he won't shut up about how Binance is the best exchange and CZ is a genius."
"Binancians are always shilling BNB and talking about how the Binance Smart Chain is gonna flip Ethereum."