Coinboin Share definition Flag Coinboin is ain’t like no whiteboy you have ever seen who smokes, wears bucket hats or bennies with pom pom and goes to hcrhs. He is also a very cool guy. Person one”Is that Coinboin” Person two”That’s must be him he’s so cool” Coinboin by OgBALLER6969696 October 22, 2022 Get the Coinboin mug.