Green’s Dictionary of Slang

shithole n.

also shitehole
[shit n. (1a) + SE hole/hole n.1 (1a) ]

1. [19C+] the anus.

2. [1930s+] a disgusting place, an absolutely worthless place, esp. of a bar or venue [intensifier of hole n.1 (2)].

3. [1960s+] a general term of hostility; a term of abuse.

4. [1980s+] a lavatory.