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A fadoodlebop is when someone is so brain-dead they can't remember the name of the thing they're talking about. It's also what you call a useless object or a dumb island in Animal Crossing.
'It's like a fadoodlebop! I can't even name it!'
'That thing in my fridge is a fadoodlebop. I don't know what it is.'
'My island is a fadoodlebop. It's just a mess.'