When you smell something that is not there.
I got into my car one night and smelled macaroni and cheese, but I've never had it in my car. It must have been a smellucination.
May 12, 2012 Urban Word of the Day
To 'smellucinate' - to imagine a smell that isn't actually there, as if to 'hallucinate'.
To experience a 'smellucination'.
"I thought I could smell weed, but it seems I was just smellucinating".
"I had a smellucination".