Wikipedia
Smelfungus
Smelfungus is a name given by Laurence Sterne to Tobias Smollett as author of a volume of Travels through France and Italy, for the snarling abuse he heaps on the institutions and customs of the countries he visited.
The term "smellfungus" (pl. "smellfungi") thereafter passed into broader use to describe a grumbling traveller, and might even be applied to a faultfinder in general.