A chud or C.H.U.D. is a “Cannibalistic Humanoid Underground Dweller.”
Chuds were found in the 1984 cult slasher film “C.H.U.D.” about flesh easting monsters who live under New York City, devouring their victims in a zombie-like manner.
The sequel, C.H.U.D. 2 – Bud the Chud (1989) was less serious…well, as if any film about a cannibalistic humanoid underground dwellers can be serious.