Green’s Dictionary of Slang

(Aus.) derog. term for an individual.

1985		‘Thommo’ Dict. Aus. Swearing & Sex Sayings 33: DEAD SHIT — An insignificant, passive, weak person, who shows little desire to live.
2019		C. Hammer Silver [ebook] A small place [...] full of small-minded deadshits.
2020		G. Disher Consolation 38: ‘It started with that deadshit Quinlan’.