Green’s Dictionary of Slang

(US) a general term of abuse.

1993		C. Hiaasen Strip Tease 135: A common shitbird felon.
1995		C. Hiaasen Stormy Weather 316: Sharing camp with a shitbird criminal had no appeal.
2012		T.P. McCauley ‘Lady Madeline’s Dive’ in ThugLit Sept./Oct. [ebook] ‘You and that shitbird husband of yours’.
2020		D. Whish-Wilson Shore Leave 27: AWOL, which meant time in the brig, shit-bird duty and a small drop in their rating.
2021		J. Ellroy Widespread Panic 91: The Hats pulled in a shitbird pal of George Collier.