Fadoodlebop
A fadoodlebop is what you say when you're too dumb to remember the name of something. It's also what you call a nameless object or a totally useless Animal Crossing island.
'That thing on the floor is a fadoodlebop. I don't know what it is.'
'I named my island a fadoodlebop. That's how bad it is.'
'You're a fadoodlebop. You can't even name your own dog.'