verb. To become (or make something) less offensive to the nose.
Real citation: "So, this morning, I go down to the garage to check the car out. I figure by this time, the odor molecules have had at least 12 hours to de-smellify. I open the car door--like a punch in the face, the stench hits me. It’s almost as if it had gained strength throughout the night."
(Jerry Seinfeld, "The Smelly Car," Seinfeld, April 14, 1993)
Made-up citation: "It's hard to de-smellify your apartment when you can't smell a fucking thing, including gas leaks and former bananas."