Snarfer

a person who smells their own farts or the farts from another to see how bad they smell. This person usually likes to participate in this act and makes other people smell their farts by farting into their cupped hand and throwing it into the face of another.

When you hear someone fart and then they purposely smell it afterwards, you would call them a snarfer.

He made me smell his fart, he is such a snarfer.

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