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a loud and stupid way to show you're happy, like a dog who just got a bone and a sandwich.
'Fadidaleedoop! I just passed my math test!', said by a kid who got a 52.
'Fadidaleedoop! I ate three burgers!', said by someone who looked like a human trash can.
'Fadidaleedoop! My pants are on fire!', said by a kid who just realized he wore his mom's socks as gloves.