When someone sniffs their ass by using their finger.
"Dude, what the fuck did you just Ass sniffed?"
"N-no.."
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The smell of ass even when not presently sniffing one; The lingering effects from placing your nostril on someone's sweaty ass hole and deeply inhaling.
Michael was diagnosed with ass sniff-itis after spending the day with his boyfriend.
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Someone who farts under the covers, and they stick their head under to smell their own ass.
You must be really cold. Either that or you farted, you sniff ass!