Green’s Dictionary of Slang

abused, humiliated; ext. as shat on from a great height.

1940		P. Larkin letter 20 Dec. in Thwaite Sel. Letters (1992) 5: I’ve read all the interesting books I brought & feel generally shat upon.
1967–8		Baker et al. CUSS 192: Shat on Reject someone for membership in a club, frat., etc.
1979		New Society L 248: Tales will often, he says, feature a popular belief (that we are daily in danger of being shat on from a great height).
1984		Partridge DSUE (8th edn) 1044/2: shat on from a great height. reprimanded by someone of a much higher rank. Services , esp. Can – WW2 [...] .
1987		Eble Campus Sl. Oct. 6: shat upon – treated unfairly.
1997		P. Tapon Parisian from Kansas 167: I also found a crappy job, getting shat on from a great height by MBA types with designer suspenders.
1999		N. Cohn Yes We have No 217: When you squat, you expect to be shat on.
2006		A. McKinty Dead Yard 30: Course, if I scarpered it would mean reneging on my agreement with Samantha. Undoubtedly she would see that I got shat on from a great height.