Green’s Dictionary of Slang

shitpot n.

[shit n. + SE pot]

1. [mid-18C+] a chamberpot, a lavatory.

2. [mid-19C+] (also shitepot) an unpleasant person.

3. [mid-19C+] an unpleasant place, or inferior object; occas. as attrib.

4. [1940s+] (also shitpotful) a large amount, lit. a chamberpot-ful.