Fadoodlebop
A fadoodlebop is a name for something you don't know what it is. It's also a name for something nobody cares about. Or it's just a stupid name for a stupid island.
'That shirt is a fadoodlebop. I don't even know what it is.'
'My island is a fadoodlebop. Nobody visits it.'
'He called my dog a fadoodlebop. That's the worst insult ever.'