Place it at the end of a pestering exchange, just after the repeated request, then follow it with a shocked reaction for the other person's response and an awkward laugh to close the scene.
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This is a short spoken Russian phrase, 'Da otstan,' lasting about 1.7 seconds, delivered as a blunt brush-off in a single voice. It sounds impatient and dismissive, with a dry, exasperated edge that makes the refusal feel both firm and funny. The clipped delivery gives it the feel of a real-life pushback, perfect for cutting off pestering without a longer argument.