To take a selfie while shitting on a toilet. Usually used to show off how nice of a place you frequent to empty your bowels.
Guy1: Dude, I heard your favorite restaurant is closing down.
Guy2: Yeah, but it's ok. I got to take one last smellfie in their amazing bathroom.
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When you take a selfie of your asshole.
Girls on r/gonewild love to post smellfies
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