What is the meaning of Fenny?

Characteristic of or resembling a fen (characteristically alkaline wetland containing peat below the waterline); marshy, swampy; also, of land: containing a fen or fens.

Now chiefly of plants: growing or living in a fen.

Muddy; hence, dirty, filthy.

fenny, marshy; like a fen

rotten, tainted, sinful

Source: wiktionary.org