From Wiktionary, the free dictionary
From fox + shit.
foxshit (uncountable)
- (vulgar) The excrement of a fox.
- Synonyms: billiting, scumber
1979, Gutcheon, Beth Richardson, The New Girls[1], →OCLC:They gallop around chasing a bag of foxshit.
1999, Mitchell, David (David Stephen), Ghostwritten : A Novel in Nine Parts[2], →OCLC:You wreck my palate with your brew of nettles and foxshit: What kind of stomach do you think I have?