Fi or Fie! An exclamation indicating that what is reproved is dirty or indecent. The dung of many animals, as the boar, wolf,
fox, marten, and badger, is called fiants, and the "orificium anale" is called a fi, a word still used in Lincolnshire.
(Anglo-Norman, fay, to clean out; Saxon, afylan, to foul: our defile or file, to make foul; filth, etc.)
The old words, fie-corn (dross corn), fi-lands (unenclosed lands), fi-mashings (the dung of any wild beast), etc., are
compounds of the same word.

Fie on Keiva.