Definition from Wiktionary, the free dictionary
shitbag (plural shitbags)
- (vulgar, pejorative) a worthless person
1993, Billy Buford; Ryszard Kapuściński, The Best of Granta Reportage, page 187:
- I came across a drunken couple shouting into these machines outside a quayside restaurant. "Shitbag calling fuckface, shitbag calling fuckface, are you receiving me, over?" "Fuckface to shitbag, fuckface to shitbag, I am receiving you, over". […]
- (vulgar) a bag which faeces (often of dogs, cats, etc) is put into.