Green’s Dictionary of Slang

shithouse n.

also shitehouse
[shit n. (1a) + SE house]

1. [late 17C+] a lavatory.

2. attrib. use of sense 1.

3. in fig. use, as an intensifier.

4. [mid-17C; 1940s+] an unpleasant person.

5. [1940s+] any place judged second-rate, usu. dirty, messy, disgusting.

6. [1960s] a jail.

7. [1960s+] (orig. Aus.) a bad situation.

8. [1990s+] a coward.

In derivatives

shithousery (n.) [popularized in UK during 2018 World Cup]

an attempt to gain an advantage by unfair means.

In phrases

feel like a haunted shithouse (v.)

[2000s] (N.Z.) to have a bad hangover.

out on its/one’s own like a country shithouse (adj.) (also like a country dunny)

[1910s+] (Aus./N.Z.) unique, unrivalled; thus stand out like a country shithouse v.

shithouse full of (n.)

[20C+] (US) a very large number or amount.

to the shithouse (adv.) [as a euph. for SE hell]

[1970s+] (Aus.) to pieces, ‘to hell’.