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1. sniff it
Phrase used to nonchalantly dismiss someone or someone else's opinion.

Used as an alternative to "piss off" or "sit on it".
My boss told me that he needed the reports by noon, so I told him to "sniff it".
2. Sniff it
to suffer, to make one suffer.
You better straighten up your act or you going to be sniffing it. You're making me mad, there's the door, sniff it.
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