Green’s Dictionary of Slang

(US) second-rate, run-down.

1913		N.Z. Observer 10 May 20/3: The woprk of a research chemist [...] mostly lands him on slumgullion heaps and tropical swamps.
1949		(con. 1943–5) A. Murphy To Hell and Back (1950) 100: What had he to save? [...] A room in a slumgullion boarding house.