When a certain smell gives you feelings of transcendence. I.e. nostalgia for a time long passed triggered by smell.
Ben: Whoa. This wet pumpkin smells like the mushrooms we took camping last summer! I am getting scentimental over here!
Brian: Something smells like shi-
Dave: ...like my hockey bag from when I was a kid!
Brian: Look at you, being all scentimental!
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After detailing the lawyer's car, I dropped a fart bomb in his car. I gave him his keys back.
He said, "the car looks good now."
I said, "My scentiment, exactly."