Green’s Dictionary of Slang

third-rate, incompetent.

1600		Dr. Dodypoll in Bullen III (1884) I i: A fustie Potticarie ever at hand with his fustian drugges, attending your pispot worship.
1637		J. Taylor Drinke and Welcome 21: But hang base pispot cheating Mountebankes.
1936		J.T. Farrell World I Never Made 268: That pisspot stinker!
1969		N. Cohn Awopbop. (1970) 244: Its instant acceptance of pisspot bards as messiahs.
1990		J. Healy Streets Above Us (1991) 197: These piss-pot fans are ripping up the platform benches.
2000		G.V. Higgins At End of Day (2001) 92: Just another one Jery’s chicken-shit, piss-pot, dog-ass operations.
2005		P. Temple Broken Shore (2007) [ebook] Anyway, where do you get off? I don’t answer to you. Worry about your own fucking pisspot station.