1A pit in which farmyard manure and other waste is stored; a muck or slurry pit. More generally: a refuse pit; a (domestic) midden; an ash pit.
Recorded earliest in "dung-pit reeking" adjective Obsolete rare that smells or steams like a dung pit.
2A hole in the ground into which an animal habitually deposits its faeces.
Originally and chiefly with reference to such pits dug and used by groups of badgers.
Late 16th century; earliest use found in John Marston (bap. 1576, d. 1634), poet and playwright. From dung + pit.