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Bravo and Sierra are military words that help soldiers talk without getting confused. But when you say 'I call Bravo Sierra,' you're basically telling someone to shut up because you think they're full of crap.
'I call Bravo Sierra,' he said after his friend told him the same story for the 10th time.
'I call Bravo Sierra,' she texted him during the meeting.
He whispered, 'I call Bravo Sierra,' after the boss said the dumbest thing ever.