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A fancy way to say you're gonna show up in 10 minutes, even if you're stuck in traffic or eating a taco.
'I'll be there in a dime.', said by someone who just got stuck behind a slowpoke.
'I'll be there in a dime.', said by someone who forgot they had to go to the store.
'I'll be there in a dime.', said by someone who promised they'd be there in a dime, then took a nap.