A person who sniffs the penis of his/her significant other for fidelity verification.
**This is a "red flag" for lack of trust in a relationshp.
1. Maria tired of always asking Joe where he'd been every time he came home late. She became a "penis sniffer" to confirm her suspicions that Joe was cheating on her. (She also suspected that it Veronica from the accounting department, but first thing first.)
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A term of insult to claim that someone sniffs penises. Better used towards males.
"John you're such a freaking penis sniffer!"
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